"The font on the memos is a TrueType TNR, used as a default on most Windows version of MSWord. Subtle differences, including kerning and letterspacing, from the font created in 1931."
If above statement is true, and I hope it is, then you have the first DEFINITIVE evidence of fraud. Now, please elaborate further on why the font indicates TrueType TNR rather (sorry) than IBM Executive Times Roman.
I just remembered this from another Freeper posting to me yesterday.
Try to reproduce these documents in other word processing platforms, using their default settings. WordPerfect, for example.