aren't sorted and cataloged, I'd keep them in one or more tins. You know, like cookies or flavored popcorn come in. (Ours were in pretzel tins, til I finally sorted 'em out).

I finally organized the collection....any that are covers only are in 3 ring binders along with chips, postcards, etc. One of each full (or partial) books is stored open, alphabetical by casino, in small drawers. (In 3x4 plastic bags, with the casino name on the bag). Duplicates are still in pretzel tins.