when I began to lose my sight I sold a lot of my books and donated 2 grocery sacks full to the library, there weren't older books, all from 2000 and newer. The ones from the 70s to 2K were long gone. Only 3 are in the livrary, the rest went to the library sales. There just isn't any call for them.
There are a few that still demand good prices and should go to ebay/amazon if anyone in the guild is interrested in taking on the task. Or even list them all on amazon or ebay store, it isn't hard, just about everything is prefilled now.
if not, donate, and let them go where they may. I don't blame hosting venues for not wanting to store them.