I know this may be from out in left field, but perhaps the OT has been already preserved. Maybe not to everyone's high standards, but perhaps Lucas has preserved the originals to his satisfaction.

What I'm getting at, maybe there is a possibility that Lucas has the originals preserved and has sent those materials to be locked up somewhere never to be revealed until after his death. That way he can preserve history, but also preserve his belief that the existing SE's are the definitive versions at least while he's still alive and able to control it.

Maybe...just maybe.