My grandparents passed away recently, and my mother is cleaning out their house. They have some vintage board games (ca. 1960's, maybe?) in their house, and she's wondering what to do with them. I don't know if any of them are collectible or not; she sent me a rather low-res picture in which a few are identifiable: Mille Bornes, Barrel of Monkeys, Flinch, Contack, Yahtzee, a few card games like Old Maid and Crazy Eights.
How would I go about finding out if there's a market for any of these? I tried checking BoardGameGeek, which shows what's for sale there and on eBay, but that tells me nothing about whether anyone is actually buying those games (well, in some cases it tells me a little; if there are a bunch of eBay auctions, all with no bids, there probably isn't much demand).
Is there any good way for me to determine if there's a demand for any of these games? Is there a good place I should try and sell them? Or should I just give them to the local thrift store, as it probably won't be worth the hassle of storing them and listing them for sale?