Then, why didn't that someone get a typewriter of that era, no, the same typewriter used in those offices, to type the memos? This would have been A) easy, B)cheap, and C) make the controversy one of he said/she said instead of a presumption of fraud.
To me, something continues to smell. 
"...someone in the outfit got hold of the real ones...." and what? Thought it would be a good idea to retype them instead of producing the originals?
My mother would strike me with a lightning bolt from heaven for disparaging the elderly but geez, this woman needs to be hustled off the stage and fast - she makes things worse for them with every sentence.
On second thought....leave her right where she is.