Honestly, if they wanted to forge a document, wouldn't you put a little more thought into it? If this turns out to be forged somebody should be given a ticket for stupidity. There are lots and lots of free "typewriter" fonts on the web designed to look like old monospace typewriters and even to look like old teletype machines, why would you be so foolish as to not use one of those?
Regardless, any of the ball type (and disc type) have flaws from tooling etc.. I also remember my IBM balls getting clogged with residue and I cleaned them with a needle. Where are the flaws in these memos? I don't see them? How likely is it that they were done on different typewriters. Killian didn;t type them himself. With those comments (sugar coating..going upstairs), you know damn well he typed them himself.