However, it is not known, except perhaps to IBM, whether any such Custom IBM Executive Model D was ever made. And, if one or more were made, who purchased it and what happened to it.
Moreover, while the fonts available to IBM would have been close to Times New Roman, there is no evidence that IBM ever licensed that font in the 1950s. The font was pretty much unknown outside of books and the London Times before Apple and Microsoft licensed it around 1990. Times New Roman makes a perfect match, the fonts available on even the Executive Model D do not.
One needs to read Bouffard's analysis as reported by INDCJournal and, of course, the Newcomer article, which taken together make it clear it would have been virtually impossible for the memos to be anything other than clumsy Word forgeries.
And, that's before applying Occam's Razor to the series of unlikely events that would have had to occur to even get close: non-typist types memos without typographical errors on a tricky-to-use IBM Executive Model D that was custom ordered by the Texas Air National Guard (or the Air Force and handed down) with a rarely used font with special superscript keys. Uh, huh. Right.
And, that's before applying Occam's Razor to the series of unlikely events ...Bingo!
Putting this in the perspective that this guy is a) enjoying his 15 minutes of fame, b) is only a typewriter mechanic and c) Fox has put on actual document analysts who have said these docs are forgeries - the jig is AFAIAC ...