The chips, the roulettes, the tokens, the checks, the cards, ashtrays, swizzle sticks, the dice...

"Chips" are Checks a promise to pay.

Tokens are not legal tender and only for gambling.
But both have the value marked on them.

They are a promise by the casino to pay that amount of money to the person holding it. (don't ask if it's about $5,000 chips and The Horseshoe )

Roulettes have no value, and that value changes when the player declares what he is playing for. That's why the casino doesn't care about the rest, but cares about Roulette chips.

But legally, all the chips belong to the casino, while they are live in play. Chips that have become obsolete and gone through the redemption, have no value, no promise to pay, kind of like a canceled check. I'd say that casinos don't have any reason or interest, for a claim to then.