Where are DTMF sound files on iOS 11?

I'm using iOS' DTMF audio files at /System/Library/Audio/UISounds/dtmf-0.caf etc..

These files can no longer be found there on iOS 11.

Has anyone found them? Or, can you confirm Apple no longer has DTMF as files, but rather generates them?

/System/Library/Audio/UISounds/nano

/System/Library/Audio/UISounds/acknowledgment_received.caf
/System/Library/Audio/UISounds/acknowledgment_sent.caf
/System/Library/Audio/UISounds/alarm.caf
/System/Library/Audio/UISounds/begin_record.caf
/System/Library/Audio/UISounds/camera_timer_countdown.caf
/System/Library/Audio/UISounds/camera_timer_final_second.caf
/System/Library/Audio/UISounds/connect_power.caf
/System/Library/Audio/UISounds/ct-busy.caf
/System/Library/Audio/UISounds/ct-congestion.caf
/System/Library/Audio/UISounds/ct-error.caf
/System/Library/Audio/UISounds/ct-keytone2.caf
/System/Library/Audio/UISounds/ct-path-ack.caf
/System/Library/Audio/UISounds/end_record.caf
/System/Library/Audio/UISounds/engage_power.caf
/System/Library/Audio/UISounds/focus_change_app_icon.caf
/System/Library/Audio/UISounds/focus_change_keyboard.caf
/System/Library/Audio/UISounds/focus_change_large.caf
/System/Library/Audio/UISounds/focus_change_small.caf
/System/Library/Audio/UISounds/go_to_sleep_alert.caf
/System/Library/Audio/UISounds/jbl_ambiguous.caf
/System/Library/Audio/UISounds/jbl_begin.caf
/System/Library/Audio/UISounds/jbl_cancel.caf
/System/Library/Audio/UISounds/jbl_confirm.caf
/System/Library/Audio/UISounds/jbl_no_match.caf
/System/Library/Audio/UISounds/key_press_click.caf
/System/Library/Audio/UISounds/key_press_delete.caf
/System/Library/Audio/UISounds/key_press_modifier.caf
/System/Library/Audio/UISounds/keyboard_press_clear.caf
/System/Library/Audio/UISounds/keyboard_press_delete.caf
/System/Library/Audio/UISounds/keyboard_press_normal.caf
/System/Library/Audio/UISounds/lock.caf
/System/Library/Audio/UISounds/long_low_short_high.caf
/System/Library/Audio/UISounds/low_power.caf
/System/Library/Audio/UISounds/mail-sent.caf
/System/Library/Audio/UISounds/middle_9_short_double_low.caf
/System/Library/Audio/UISounds/navigation_pop.caf
/System/Library/Audio/UISounds/navigation_push.caf
/System/Library/Audio/UISounds/new-mail.caf
/System/Library/Audio/UISounds/nfc_scan_complete.caf
/System/Library/Audio/UISounds/payment_failure.caf
/System/Library/Audio/UISounds/payment_success.caf
/System/Library/Audio/UISounds/photoShutter.caf
/System/Library/Audio/UISounds/ReceivedMessage.caf
/System/Library/Audio/UISounds/RingerChanged.caf
/System/Library/Audio/UISounds/SentMessage.caf
/System/Library/Audio/UISounds/shake.caf
/System/Library/Audio/UISounds/short_double_high.caf
/System/Library/Audio/UISounds/short_double_low.caf
/System/Library/Audio/UISounds/short_low_high.caf
/System/Library/Audio/UISounds/SIMToolkitCallDropped.caf
/System/Library/Audio/UISounds/SIMToolkitGeneralBeep.caf
/System/Library/Audio/UISounds/SIMToolkitNegativeACK.caf
/System/Library/Audio/UISounds/SIMToolkitPositiveACK.caf
/System/Library/Audio/UISounds/SIMToolkitSMS.caf
/System/Library/Audio/UISounds/sms-received1.caf
/System/Library/Audio/UISounds/sms-received2.caf
/System/Library/Audio/UISounds/sms-received3.caf
/System/Library/Audio/UISounds/sms-received4.caf
/System/Library/Audio/UISounds/sms-received5.caf
/System/Library/Audio/UISounds/sms-received6.caf
/System/Library/Audio/UISounds/Swish.caf
/System/Library/Audio/UISounds/Tink.caf
/System/Library/Audio/UISounds/Tock.caf
/System/Library/Audio/UISounds/tweet_sent.caf
/System/Library/Audio/UISounds/ussd.caf
/System/Library/Audio/UISounds/warsaw.caf
/System/Library/Audio/UISounds/wheels_of_time.caf

/System/Library/Audio/UISounds/Modern/camera_shutter_burst_begin.caf
/System/Library/Audio/UISounds/Modern/camera_shutter_burst_end.caf
/System/Library/Audio/UISounds/Modern/camera_shutter_burst.caf

/System/Library/Audio/UISounds/nano/3rdParty_DirectionDown_Haptic.caf
/System/Library/Audio/UISounds/nano/3rdParty_DirectionUp_Haptic.caf
/System/Library/Audio/UISounds/nano/3rdParty_Failure_Haptic.caf
/System/Library/Audio/UISounds/nano/3rdParty_Retry_Haptic.caf
/System/Library/Audio/UISounds/nano/3rdParty_Start_Haptic.caf
/System/Library/Audio/UISounds/nano/3rdParty_Stop_Haptic.caf
/System/Library/Audio/UISounds/nano/3rdParty_Success_Haptic.caf
/System/Library/Audio/UISounds/nano/Alarm_Haptic.caf
/System/Library/Audio/UISounds/nano/Alarm_Nightstand_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_3rdParty_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_3rdParty_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ActivityFriendsGoalAttained_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ActivityGoalAttained_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ActivityGoalAttained_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ActivityGoalBehind_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ActivityGoalBehind_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ActivityGoalClose_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_BatteryLow_10p_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_BatteryLow_5p_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_BatteryLow_5p_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Calendar_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Calendar_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Mail_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Mail_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_MapsDirectionsInApp_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Messages_1_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Messages_1_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Messages_2_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Messages_3_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_PassbookBalance_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_PassbookGeofence_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_PassbookGeofence_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_PhotostreamActivity_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ReminderDue_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_ReminderDue_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_SpartanConnected_LowLatency_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_SpartanConnecting_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_SpartanConnecting_LowLatency_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_SpartanDisconnected_LowLatency_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Voicemail_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_Voicemail_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Alert_WalkieTalkie_Haptic.caf
/System/Library/Audio/UISounds/nano/AutoUnlock_Haptic.caf
/System/Library/Audio/UISounds/nano/BatteryMagsafe_Haptic.caf
/System/Library/Audio/UISounds/nano/Beat_Haptic.caf
/System/Library/Audio/UISounds/nano/BuddyPairingFailure_Haptic.caf
/System/Library/Audio/UISounds/nano/BuddyPairingRemoteConnection_Haptic.caf
/System/Library/Audio/UISounds/nano/BuddyPairingRemoteTap_Haptic.caf
/System/Library/Audio/UISounds/nano/BuddyPairingSuccess_Haptic.caf
/System/Library/Audio/UISounds/nano/busy_tone_ansi.caf
/System/Library/Audio/UISounds/nano/busy_tone_cept.caf
/System/Library/Audio/UISounds/nano/call_waiting_tone_ansi.caf
/System/Library/Audio/UISounds/nano/call_waiting_tone_cept.caf
/System/Library/Audio/UISounds/nano/CameraCountdownImminent_Haptic.caf
/System/Library/Audio/UISounds/nano/CameraCountdownTick_Haptic.caf
/System/Library/Audio/UISounds/nano/CameraShutter_Haptic.caf
/System/Library/Audio/UISounds/nano/ct-call-waiting.caf
/System/Library/Audio/UISounds/nano/Detent_Haptic.caf
/System/Library/Audio/UISounds/nano/DoNotDisturb_Haptic.caf
/System/Library/Audio/UISounds/nano/dtmf-0.caf
/System/Library/Audio/UISounds/nano/dtmf-1.caf
/System/Library/Audio/UISounds/nano/dtmf-2.caf
/System/Library/Audio/UISounds/nano/dtmf-3.caf
/System/Library/Audio/UISounds/nano/dtmf-4.caf
/System/Library/Audio/UISounds/nano/dtmf-5.caf
/System/Library/Audio/UISounds/nano/dtmf-6.caf
/System/Library/Audio/UISounds/nano/dtmf-7.caf
/System/Library/Audio/UISounds/nano/dtmf-8.caf
/System/Library/Audio/UISounds/nano/dtmf-9.caf
/System/Library/Audio/UISounds/nano/dtmf-pound.caf
/System/Library/Audio/UISounds/nano/dtmf-star.caf
/System/Library/Audio/UISounds/nano/end_call_tone_cept.caf
/System/Library/Audio/UISounds/nano/ET_BeginNotification_Haptic.caf
/System/Library/Audio/UISounds/nano/ET_BeginNotification_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/ET_RemoteTap_Receive_Haptic.caf
/System/Library/Audio/UISounds/nano/ET_RemoteTap_Send_Haptic.caf
/System/Library/Audio/UISounds/nano/Experimental_Orb1_Haptic.caf
/System/Library/Audio/UISounds/nano/Experimental_Orb2_Haptic.caf
/System/Library/Audio/UISounds/nano/Experimental_Orb3_Haptic.caf
/System/Library/Audio/UISounds/nano/Experimental_Orb4_Haptic.caf
/System/Library/Audio/UISounds/nano/Experimental_Orb5_Haptic.caf
/System/Library/Audio/UISounds/nano/GoToSleep_Haptic.caf
/System/Library/Audio/UISounds/nano/HourlyChime_Haptic.caf
/System/Library/Audio/UISounds/nano/HummingbirdCompletion_Haptic.caf
/System/Library/Audio/UISounds/nano/HummingbirdNotification_Haptic.caf
/System/Library/Audio/UISounds/nano/jbl_begin.caf
/System/Library/Audio/UISounds/nano/jbl_cancel.caf
/System/Library/Audio/UISounds/nano/jbl_confirm.caf
/System/Library/Audio/UISounds/nano/MessagesIncoming_Haptic.caf
/System/Library/Audio/UISounds/nano/MessagesOutgoing_Haptic.caf
/System/Library/Audio/UISounds/nano/NavigationGenericManeuver_Haptic.caf
/System/Library/Audio/UISounds/nano/NavigationGenericManeuver_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/NavigationLeftTurn_Haptic.caf
/System/Library/Audio/UISounds/nano/NavigationLeftTurn_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/NavigationRightTurn_Haptic.caf
/System/Library/Audio/UISounds/nano/NavigationRightTurn_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/Notification_Haptic.caf
/System/Library/Audio/UISounds/nano/Notification_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/OnOffPasscodeFailure_Haptic.caf
/System/Library/Audio/UISounds/nano/OnOffPasscodeUnlock_Haptic.caf
/System/Library/Audio/UISounds/nano/OnOffPasscodeUnlockCampanion_Haptic.caf
/System/Library/Audio/UISounds/nano/OrbExit_Haptic.caf
/System/Library/Audio/UISounds/nano/OrbLayers_Haptic.caf
/System/Library/Audio/UISounds/nano/PhoneAnswer_Haptic.caf
/System/Library/Audio/UISounds/nano/PhoneHangUp_Haptic.caf
/System/Library/Audio/UISounds/nano/PhoneHold_Haptic.caf
/System/Library/Audio/UISounds/nano/PhotosZoomDetent_Haptic.caf
/System/Library/Audio/UISounds/nano/Preview_AudioAndHaptic.caf
/System/Library/Audio/UISounds/nano/QB_Dictation_Haptic.caf
/System/Library/Audio/UISounds/nano/QB_Dictation_Off_Haptic.caf
/System/Library/Audio/UISounds/nano/RemoteCameraShutterBurstBegin_Haptic.caf
/System/Library/Audio/UISounds/nano/RemoteCameraShutterBurstEnd_Haptic.caf
/System/Library/Audio/UISounds/nano/ringback_tone_ansi.caf
/System/Library/Audio/UISounds/nano/ringback_tone_aus.caf
/System/Library/Audio/UISounds/nano/ringback_tone_cept.caf
/System/Library/Audio/UISounds/nano/ringback_tone_hk.caf
/System/Library/Audio/UISounds/nano/ringback_tone_uk.caf
/System/Library/Audio/UISounds/nano/Ringtone_UK_Haptic.caf
/System/Library/Audio/UISounds/nano/Ringtone_US_Haptic.caf
/System/Library/Audio/UISounds/nano/RingtoneDucked_UK_Haptic.caf
/System/Library/Audio/UISounds/nano/RingtoneDucked_US_Haptic.caf
/System/Library/Audio/UISounds/nano/SalientNotification_Haptic.caf
/System/Library/Audio/UISounds/nano/SedentaryTimer_Haptic.caf
/System/Library/Audio/UISounds/nano/SedentaryTimer_Salient_Haptic.caf
/System/Library/Audio/UISounds/nano/SiriAutoSend_Haptic.caf
/System/Library/Audio/UISounds/nano/SiriStart_Haptic.caf
/System/Library/Audio/UISounds/nano/SiriStopFailure_Haptic.caf
/System/Library/Audio/UISounds/nano/SiriStopSuccess_Haptic.caf
/System/Library/Audio/UISounds/nano/sms-received1.caf
/System/Library/Audio/UISounds/nano/Stockholm_Haptic.caf
/System/Library/Audio/UISounds/nano/StockholmActive_Haptic.caf
/System/Library/Audio/UISounds/nano/StockholmActiveSingleCycle_Haptic.caf
/System/Library/Audio/UISounds/nano/StockholmFailure_Haptic.caf
/System/Library/Audio/UISounds/nano/StopwatchLap_Haptic.caf
/System/Library/Audio/UISounds/nano/StopwatchReset_Haptic.caf
/System/Library/Audio/UISounds/nano/StopwatchStart_Haptic.caf
/System/Library/Audio/UISounds/nano/StopwatchStop_Haptic.caf
/System/Library/Audio/UISounds/nano/SwTest1_Haptic.caf
/System/Library/Audio/UISounds/nano/SystemStartup_Haptic.caf
/System/Library/Audio/UISounds/nano/Timer_Haptic.caf
/System/Library/Audio/UISounds/nano/TimerCancel_Haptic.caf
/System/Library/Audio/UISounds/nano/TimerPause_Haptic.caf
/System/Library/Audio/UISounds/nano/TimerStart_Haptic.caf
/System/Library/Audio/UISounds/nano/TimerWheelHoursDetent_Haptic.caf
/System/Library/Audio/UISounds/nano/TimerWheelMinutesDetent_Haptic.caf
/System/Library/Audio/UISounds/nano/UISwipe_Haptic.caf
/System/Library/Audio/UISounds/nano/UISwitch_Off_Haptic.caf
/System/Library/Audio/UISounds/nano/UISwitch_On_Haptic.caf
/System/Library/Audio/UISounds/nano/vc~ended.caf
/System/Library/Audio/UISounds/nano/vc~invitation-accepted.caf
/System/Library/Audio/UISounds/nano/vc~ringing.caf
/System/Library/Audio/UISounds/nano/VoiceOver_Click_Haptic.caf
/System/Library/Audio/UISounds/nano/WalkieTalkieActiveEnd_Haptic.caf
/System/Library/Audio/UISounds/nano/WalkieTalkieActiveStart_Haptic.caf
/System/Library/Audio/UISounds/nano/Warsaw_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutComplete_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutCountdown_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutPaused_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutPressStart_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutResumed_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutSaved_Haptic.caf
/System/Library/Audio/UISounds/nano/WorkoutSelect_Haptic.caf

/System/Library/Audio/UISounds/New/Anticipate.caf
/System/Library/Audio/UISounds/New/Bloom.caf
/System/Library/Audio/UISounds/New/Calypso.caf
/System/Library/Audio/UISounds/New/Choo_Choo.caf
/System/Library/Audio/UISounds/New/Descent.caf
/System/Library/Audio/UISounds/New/Fanfare.caf
/System/Library/Audio/UISounds/New/Ladder.caf
/System/Library/Audio/UISounds/New/Minuet.caf
/System/Library/Audio/UISounds/New/News_Flash.caf
/System/Library/Audio/UISounds/New/Noir.caf
/System/Library/Audio/UISounds/New/Sherwood_Forest.caf
/System/Library/Audio/UISounds/New/Spell.caf
/System/Library/Audio/UISounds/New/Suspense.caf
/System/Library/Audio/UISounds/New/Telegraph.caf
/System/Library/Audio/UISounds/New/Tiptoes.caf
/System/Library/Audio/UISounds/New/Typewriters.caf
/System/Library/Audio/UISounds/New/Update.caf