If we had the papyrus from which the Book of Abraham was translated-- and I testify that we do not-- the critics would not believe it; and most of them could not read it anyway.
I don't know enough about the way the word "testify" is used in the LDS community to know whether it necessarily implies testimony, or whether it could be used to relate a more general, evidentiary knowledge. Maybe y'all can help answer that for me. If Gee has a testimony of the missing papyrus theory, that might help explain why he feels such a need to make the facts to fit the theory.
Another interesting thing about this remark is that it assumes that if the Book of Abraham's source were extant (which it is), its text would translate Egyptologically as the Book of Abraham (which it does not). The catalyst theory, in other words, does not even appear to be on the table for Gee. I've frequently been told by believing Mormons of the FARMS variety that "fundamentalist assumptions" are the cause of most apostasies from the church. By continuing to publish Gee's missing papyrus essays, despite the obviously poor quality of his research and reasoning, is not the FR setting its readers up for apostasy?
Best,
-Chris