You might want to tell your children to check with an auctioneer. We were going to throw out a cardboard poster (I think from the 1980's) and our auctioneer said no, it will sell.
My kids have asked me too why I keep some things like my grandpa's camelback trunk. To me this is a duh, its my grandpas'. Its not in good shape on the outside but the inside has a beautiful tray and between it and the inside of the lid are 3 pictures on them. Well a feew weeks ago one of my sons called and said he was watching a show and a trunk like mine went for $500 and if it were fixed up it would sell for up to $3000 and the tv trunk didn't have the 3 pictures, so now my son says I can keep it.