Are you interested in a trade, sell, or if you can’t part with them, possibly a copy of the files?
For trade, I have a few extra copies of some games, though the only quasi rare one I have is King’s quest III for the CoCo (still looking for Larry 1 for the Coco), or I can tade back files in response if you want any of the EGA versions I have (I only have one physical copy of each though)
I’m putting together a collectors site in my spare time (which isn’t much I’m afraid), concentrating on the catalogs, ads, movies, in general, and downloads of the harder to find versions of sierra games (like the ega versions I’ve listed, Kings quest 4 AGI etc, Space Quest 1 AGI with the ‘ken’ easter egg).