Mike,
I collect Idaho chips and maintain a list of all known. I have the REX chip listed as THE REX--Twin Falls. I will have to get back to you on the attribution.
There are six different bars (and towns) that have OWL tokens, so there are at least that many possibilities.
If want to sell or trade for the chips ( I may need four of the ones pictured), I would difinately make it worth your while, you could end up with many more chips.
Please let me know if you get anymore information on the chips.
Hope this helps a little.
Thanks,
Bill