Update: bookdealer posted the following additional information to the James Bon $1000 chip lot (eBay item 16031449) and terminated the auction early:

>Hello to All...We have been told that this chip is not real (Even though
>we have a statement from the California Prop dealer that we bought it
>from that it is) we are going to end the auction early, because it's not
>worth the threats of this person who keeps contacting us about it...We
>have been with ebay for over a year and try our best to make our customers
>happy., For those who have bid on it, I am Sorry for all your trouble...
>Thank You. Bookdealer

No indication what he will do about the high bid (other than as previously
stated that he would let the bidders know. And no response yet from eBay.
Will post more information when I have it.