There was a time machine, Al Gore invented it. For verification just ask tipper.(the whale music girl)
This model has been around since at least 1960. Thus Col. Killian could have used it to go forward to at least the year 2001 and pick up a laptop computer with Windows XP and Word and an HP Laser printer and return back to 1972 to complete these memos.
So obviously the documents could be authentic.
As a matter of fact, I think I saw someone fitting Killian's description in Comp USA last week buying a lap top. Coincidence? I don't think so.