Ummm-- collectibles takes in everything from postage stamps to legos to sportscards to vintage pop bottles.
Whatever people like to collect.
You need to set up a Search for the brand* name of your items , then add the date and number.
There is a very small secondary market for these things, as in for anything designed to be sold as a collectible, so you may be able to pick your missing pieces up for a lot less than the rest of the items you bought on subscription.
*Bradford Plate Exchange, Franklin Mint etc.