I'm assuming that for any given movie, there is only one "camera negative" copy of it that could possibly exist. Anything else would have to have been made from the original negative. Therefore, the original negatives of the Star Wars films don't exist because of the changes made to them for the SE, as long as everyone has their stories straight.
That MTV interview quote from Lucas means a lot. He said it, it's out there and we can hold him to his word. Heh, now he'll see what we want. Yes, because this website didn't exist until he gave the go ahead....