All chips used in a casino for something of value needs to be gaming approved. 2 free drinks is value.
One thing is a given fact.
If they were turned down by gaming like Vince says, they would NEVER have been delivered to the casino by the distributor. Huge fines if they deliver non approved chips.
Am I missing something? There is no name on the chips that I can see in the scan. Looks like B&G chips?