Here is Dave Pawson's response to my post to him noting that the Mizpah "error" chips he is selling are fantasy chips. He has not, however, as yet made a full disclosure.

"I appreciate the information. I have had these chips a few years now, and
was of the impression they were genuine errors. I will make corrections to
the listings when I get home tonight. I would appreciate it if you would let
your folks know that I'm not contending anything, particularly BS, I am merely
trying to get rid of those chips I have that are not in the area of my true
interest."
-Dave
http://cgi.ebay.com/Error-Chip-Mizpah-Casino-TOHOPAH-5000_W0QQitemZ6280667066QQcategoryZ63756QQrdZ1QQcmdZViewItem