Ebay is so asleep at the wheel half the time, I'm surprised they would even notice. (They screwed their search engine up royally several days ago.) Can't find the listing, so I presume it's gone now. :(
A 70mm reel might be useful in documenting the visual differences from the 35mm version if nothing else. Doubt anybody has a projector in their basement.
Post this sort of thing in the preservation section next time! Talk of old film reels has not been verboten so far.