I'm not 100% sure, but I think the "search title" method also picks up items with the search terms in the category description. I have noticed, for example, when I search for Matchbox cars, I often turn up Hot Wheels cars that do not have "Matchbox" in the title, but it turns out the Hot Wheels cars have been placed in the Matchbox category.

I do try to include "casino chip" in my titles because, like I said, I'm not 100% sure how often the eBay search function picks up the category description as well.

Has anyone else noticed similar results?