As a wrap up to this thread, I would like to state for the record that Mike Dunigan and I spoke personally at the US Mexican Numismatic Association meeting and that he completely agrees with me that the 1829 Zs AO is a counterfeit. He said this in the presence of Jay Turner a finalizer for NGC who was also at the meeting.
I wrote to Jay after the coin appeared for a third time on
ebay and his efforts got the coin pulled once again.
I want to thank Mike Dunigan for his willingness to speak with directly on the subject and to clearly indicate that the coin is a counterfeit NOT a mint made item.