My inspection of the federal laws would not indicate a forgery offense, primarily because (and if) the documents do not constitute a governmental record (they were supposedly kept for his own files). The use of the looser mail and wire fraud statutes seems more applicable to the original source, along with state forgery laws. The subsequent people who passed these on did not, of course, "forge" anything, but there is still fraud to contend with, and more importantly, the potential for accessory liability.
Well, the order to George Bush is a government record, just as much as after action reports and the like.
I reach my conclusion because these documents would have no legal effect even if they were authentic. They are worthless, except as a matter of misrepresenting history.