You would also have to be clairvoyant or a time traveler from the future.
While this point has not been made much of, since everyone seems to be focused on the POSSIBILITY of creating these documents in 1972 and 1973, few have considered the liklihood that out of all the myriad fonts, spacings, line spacings, centerings, etc. available to someone using an IBM Executive or an IBM Selectric Composer, or a Linotype machine, assuming access to one, these memos used the one of millions that would precisely match a font/typeface that would not come into existence for another 10 or 15 years, and were carefully and precisely crafted with ssupreme efforts and care so that an overlay easily created in MS Word in 2004 would overlay the 20-year old documents precisely.
Now that is quite an accomplishment (understatement alert), whoever did it - if it were done in 1972/1973.
well put! plus, who believes that a man who doesn't type was given a $20,000 typewriter (in 2004 dollars) to type one perfect memo, with no mistakes, requiring a change of rotating ball several times, never to use the typewriter again, or before, would be placed in a "private file", which no one knew existed (even by his family), signed in a completely different handwriting style,was given to CBS by an unknown person?