So far no response ... the auction ended. This is the message I sent to the seller.

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Hello.

I noticed the auction you currently have on eBay for a set of chips from
the Dunes.

These chips were never used or meant to be used in the Dunes Casino. They were made as souvenirs after the casino closed. These chips are available from various chip dealers for about $1 each.

Some chip collectors consider selling these chips without any indication of what they really are as fraud. Please do the right thing and cancel this auction and put up the chips for auction again, this time indicating that they are "souvenir" or "fantasy" chips.

Thanks.