Way back 25 years ago or so, I collected baseball cards. Fast forward to today. We opened a big box from storage marked "BBC," for, well, baseball cards. As we looked at old single cards and full sets from back then, Bill asked, "Is there any gum?" I immediately pulled a piece out and offered it, HA! (He didn't go for it, if you're wondering.)
Next inning: figure out what to do with these cards and toss the gum. I don't think even eBay can provide a market for vintage gum, stuff that wasn't good when it was fresh out of the factory.