The IBM Selectric Composer theory has been debunked:
http://shapeofdays.typepad.com/the_shape_of_days/2004/09/the_ibm_selectr.html#comments
The documents are fake. Period.
Gerry proves it ... I don't see how anyone can deny this. This kind of information WILL get out. The amount of work he had to go through to get the body text close is simply unacceptable anyway; all the other features are deadly to the belief too ... but the KILLER is still the precise measurements in the Letterhead. That's just too much precision. Not "impossible," I grant you, but TOO incredible -- given all the other feature problems -- to be believable.
These documents are fake ... period.