Hello! I happen to have a Raiders of the Lost Ark onesheet that was linenbacked by John Davis at Postermountain, one of the best guys out there. Didn't have any restoration work done on it yet. Was brand new when I got it, and apart from the standard factory folds, is in awesome condition. It was never used, and was only unfolded twice before getting sent to John. It's got all the NSS info and GAU logo on it, guaranteed original.
Also have a Indiana Jones and the Temple of Doom, but that's a 40"x60". It is in near mint condition, especially hard to find in this condition because of it's size. Rolled, never folded. Also guaranteed original, NSS/GAU here as well.
I think I may have a rolled onesheet for TOD as well, and in great condition if memory serves.
Let me know if you're interested.
Steve