When a casino closes the doors (or rebrands), if the state law doesn't require the destruction of chips, vendors may try to purchase the entire lot, then sell them through their vendor forum.
We're waiting on confirmation of that rack change-over, then hoping a vendor will make them avaialable to us...
Jack's Detroit was a perfect storm. Dan Gilbert bought Greektown Casino and rebranded it Jack's Detroit. New chips were ordered, but before they could be delivered, Gilbert decided to sell. (He owns Greektown in Detroit, 2 Jacks in Ohio -- Cleveland and Cincy -- and another one, a racino in Baltimore, I thought). Because Jack's Detroit would never be used, they became available (and mint chips!)... The hope is Gilbert sells the other two in Ohio and/or the 4th casino and the old racks become available too.
Nothing to do but wait.