We had one who was a klepto. He had a stash of pen caps and assorted items in the crawlspace under our dining room. 10+ years ago he took the rubber stopper from our sink. We never saw it again....
Now we have a cat who likes to play fetch. His favorite toys are these vinyl bracelets that used to belong to my niece. He'll carry one in his mouth, set it at my feet, and rub against me and meow until I throw it.