Just went back and looked at the stretch that had the talk about Oscar wins and can’t believe I had missed it, but I just realized that one stretch has a different stock and it’s not from the same set as all my other stretches. I guess it was late at night, noticed the fading in text about Oscars and only paid attention to that. This one little stretch actually has cyan analog audio track backing, digital and a more recent film stock, so it has nothing at all to do with all the rest of the pieces I have, the ones printed on 1990 film, which all have the same look, all have black backed analog sound, no digital and whichever ones do have the date code symbols all have ones that decode to 1990.
Now I wonder if maybe they are actually not various bits from an original 1990 print (either a late in the game US one or a UK one) and not a trailer. They are not remotely grayish or under-saturated as you say the 1990 trailers that you saw were and it seems to have scenes from across the entire movie, more than I might expect trailers to cover (although trailers have been known to basically cover and spoil almost every main scene or briefly glance at them all).
On youtube, so far, I only see a single trailer posted for the original release, but since the 1997/1998 re-release had at least 4 different trailers, there were probably more than one for the original release. FWIW, while some scenes I have are in the 1989 trailer, I also have quite a few that are not in either the 1989 or single 1997 trailer on youtube. Of course if they are bits from an actual release print, you wonder what the heck happened to the rest of the print. All my little stretches probably don’t total beyond 3 minutes together. Full film is a heck of a lot of frames. I suppose over 20 years maybe it could have been slowly cut up and sold off in scattered sets of chunks?? But you’d think first reel by reel, but this would’ve have the reels kept together. So maybe it is some mix of all the 1989 trailers or something.
If it is release print bits it would have to be, I guess, either some late in the game US release print that got printed on super fresh stock made near the start of the year or a UK print.