I have some CDs with old Macintosh system software and a number of floppy discs with games that are only compatible with Mac system 6-ish. I've estimated which Mac OS would be compatible by comparing the release date with the OS release dates and noted that information on the pink post-its under the media, but can't guarantee that I'm 100% accurate.
I'm not greedy and don't know what to price them at so make me a cash offer I can't refuse and we'll do business.