I suspect everyone is correct, and these are plastic junk. But does the auction house have no responsibility to have at least basic descriptions of their items correct? It says clay chips right in the description of the lot.
I guess not...
"ADVERTISING DISCLAIMER: ALL INFORMATION WAS OBTAINED FROM SOURCES DEEMED RELIABLE. ALTHOUGH EVERY PRECAUTION HAS BEEN TAKEN TO ENSURE ACCURACY, THE PRINCIPAL, THE JAMES G. MURPHY CO., THE ADVERTISING COORDINATOR AND ALL THEIR AGENTS SHALL NOT BE RESPONSIBLE FOR ANY ERRORS OR OMISSIONS THEREIN. IT IS FOR THIS REASON THAT WE RECOMMEND THAT ALL ITEMS BE THOROUGHLY INSPECTED PRIOR TO THE POINT OF SALE."