Detecting Page Number TextBox in PowerPoint in VBA

I am trying to make a macro to update the page count of visible pages.

I have a code like this:

Sub SetVisiblePageNumers()
    Dim pageNumber As Integer
    Dim pp As String
    
    pageNumber = 1
    For Each page In Application.ActivePresentation.Slides
        If (page.SlideShowTransition.Hidden = False) Then
            For Each found In page.Shapes
               If found.**IsAPageNumberTextBox** Then
                    found.TextFrame.TextRange = CStr(pageNumber)
                 ' pp = found.TextFrame.Comment
                End If
            Next
       pageNumber = pageNumber + 1
       End If
 
    Next
End Sub

The field IsAPageNumberTextBox does not exist. But I am trying to find a way of knowing the text box is a page number. The text ‹#› is converted to page number. However I do not see how I can find this text as it would be a way of knowing that my text box is for the number.

This assumes that the page number is in its original placeholder shape.:

Sub SetVisiblePageNumers()
    Dim pageNumber As Integer
    Dim pp As String
    Dim oShape As shape
    
    pageNumber = 1
    For Each Page In Application.ActivePresentation.Slides
        If (Page.SlideShowTransition.Hidden = False) Then
            For Each oShape In Page.Shapes
                If oShape.Type = msoPlaceholder Then
                    If oShape.PlaceholderFormat.Type = ppPlaceholderSlideNumber Then
                        oShape.TextFrame.textRange = CStr(pageNumber)
                    End If
                End If
            Next
       pageNumber = pageNumber + 1
       End If
    Next
End Sub