You didn't answer Bob's question about if they come back.

But you could try a macro to remove the textboxes from the activesheet:

Option Explicit
Sub testem()
   
   Dim myShape As Shape
   Dim OLEObj As OLEObject

   For Each myShape In ActiveSheet.Shapes
       If myShape.Type = msoTextBox Then
           myShape.Delete
       End If
   Next myShape    
   
   For Each OLEObj In ActiveSheet.OLEObjects
       If TypeOf OLEObj.Object Is MSForms.TextBox Then
           OLEObj.Delete
       End If
   Next OLEObj
End Sub

The top portion deletes the textboxes from the Drawing toolbar.  The bottom
portion deletes the textboxes fom the control toolbox toolbar.

If you're new to macros, you may want to read David McRitchie's intro at:
http://www.mvps.org/dmcritchie/excel/getstarted.htm

ps.  it may take a little time to run with all those shapes.