Wow, that took me a whole minute before I could figure out what you were blathering on about. Then things started clicking... I've seen some of those keywords before in that context, and the AE codes looked familiar too. Finally I realized that you were pointing out a typo that has apparently been repeated over a series of notes where BTG was mistakingly recorded as BGT.
An explanation of your cryptic post could certainly have helped prevent me from getting terribly confused and eventually frustrated over it, and may have even shifted my attitude and prevented me from closing your post. However...
For errors in BCS grading labels, please contact BCS to get them corrected.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.