Judging by the size of the reels, this wasn't the whole movie anyway. AFAIK, there wasn't a legit Super 8 release besides Derann, and that was the complete film.
I noticed the buyer seems to be selling a lot of Super 8 films, so we might find out what's on those reels eventually.
Although I think anyone who goes out of their way to send a nastygram in reply to a polite inquiry probably isn't someone worth doing business with. Let them get ripped off, so we don't have to! ;)