"I'm tired of hearing how it "could" have been done, Dan. Produce the damn machine, tell us the model number, type the memos on it, scan them and put them on the web for comparison. OR, failing that, shut your mouth."
Precisely, this is the ONLY way to prove it.
Surely there are other Memos Killian typed, let's see those and compare. That would solve it as well.
Still wouldn't prove they were authentic - only that it could have been done on a typewriter.