Steve, if you are trying to pass off obsolete or "out of area" tokens, I might worry. However, my experience with Reno casinos is they have no problem accepting neighboring casinos' chips and tokens. I suspect the "only valid at" is there to protect the casino, and because of regulations against minting "money."

The old mechanical slot machines had a track the coins went through that clearly showed the last few coins played, to allow the casino to invalidate jackpots won by slugs. Modern slot machines drop it directly in the hopper or the drop (a bucket in the bottom). It's much harder to pass slugs today. You may even find slot machines pretty finnickey about "foreign" tokens. But not only can they not tell which coins were played last, you may have just as easily played credits from bills or winnings.

On top of that, it'd be pretty bad press to try to not pay you because you used a neighboring casino's tokens. Now, if you take Colorado tokens or Vegas tokens to Reno, for example, they'd rather you didn't. If they catch you on security cameras, they'll probably have a "talk" with you.