No originals will be found. That would only further prove they are forgeries.
Why would a file memo be copied for a dozen generations anyway? It isn't as if it was distributed anywhere other than a single file box. There is only one reason. To mask the bogus source.
And if that many generations of copies had actually been made, why didn't they surface in 1978 when he ran for Congress? Or 1994, 1998, or 2000? That many generations of copies implies that many people would have had one. There must have been incredible collusion not to have disclosed it before.