Google maps puts North Highland NE of Sacto.
I had theory working that he won the chip in an off site poker game near the San Manuel Casino in Highland.
Suppose that theory might work just as well with games with people you met in Nor Cal casinos.
My guess was that Poker Players are the most likely to be carrying one of these chips around, and maybe paid someone off at a local cash game.
My bet was that he did go to Las Vegas, found that they wouldn't cash the chip and now has it on eBay.
Do they even have a poker room in the Wynn, so that my guess might even hold water?