The only reasonable thing for him to do is slowley start gambling with the chips of smaller denominations. He's gonna neeed the patience of The 40 Year Old Virgin because he shouldn't take a single step inside the Nevada border for at least 5 years. After several hundred million people have cleansed the place, he can start in with the smaller stuff. $5, $10, $25, $50. Carrying no more than 1k in stolen chips at any time.
I'd think about hiring hire someone to cash in the big stuff for a percentage of the profit in about 10 years. At that point, you can reasonably deny knowlege of theft.