they are probably making double sure they don’t get caught like Dan Rather did, in his forgery quest. Remember how important it was to know if Bush served his entire guard duty? So important, they had to manufacture to try and discredit him.
I’m not so sure anyone would be willing to stick their neck out at this point to produce a forgery. It’s a little late in the game. Anything he finally produces will be examined with a fine toothed comb.