Joel (or anyone) -- Do you have example(s) of the "mules" you're referring to?

I'd like to see what's out there and the quality of the work. I take it you're not referring to the Whalen slug-core chips, but instead, inlays that have been pasted on blank clay chips?

Even though an in-person exam under magnification is the best way to look at suspicious chips, a scan posted here is a start in the education process.