The Showboat in AC has recently had their 15th anniversary. For this they have released a $5 chip (earlier in the month) and yesterday released their "no value" chip. This came on a keychain and was given to players by invitation (through a postcard mailer) - yesterday and today only as per the card. I do not know how many no-values were manufactured or released.

Sorry no dups of the keychain but here are the pics...

Value chip:

No Value chip:

Postcard to get chip: