That string should work well if you use it in a search of auction titles only, Ross. If you used it to also searched auction descriptions, you'd exclude lots of chips that talked about "book value", "played on the table", and "scarce pieces". These terms could well be in the description of a chip you'd like to bid on.

Before I add an exclusion to my search string, I create a test-search that will let me see all the lots that would be excluded so I can tell if that's a wise choice.