What to do with old souvenirs?

Going through my mom’s place, she saved all kinds of things from her visits to DLand. (Never went to WDW - scared of flying.) Not expensive stuff, but things like the button they gave to all guests on the 46th Anniversary of DLand, or some special souvenir park maps. Not to mention tons and tons of times guides.
Surely there are places where people share souvenirs like these, or collectors hang out to see what they can get ahold of. Anyone able to point me to a place like that?
(She also saved a lot of pins, but finding places where people buy, sell, and trade pins is easy. I’m wondering about the more obscure things)

Ebay or Facebook is what I would suggest.

Vintage items sell on Etsy.