It's in LucasLand so that's how they got access to a 35mm print. It can't be let outside a 10 mile radius most likely. The runtime is regularly 135 for the SE, but IMDB does state the original runtime is the site listed 134 minutes. Could it be...?

If it is then there is definite proof of an original existing in some kind of reference quality. They can't refute there is at least a copy of ROTJ floating about.

If it actually will be 35mm then it's likely the 97 but you never know...check it out nadcraker!