Same here. The wording on the website dances around this but doesn't address directly. The first sentence below says you'll lose the certs if you don't cancel before the flight (implying you will get them back if you do cancel beforehand?). The second sentence could be read to mean that only certs associated with flight cancellations or substituted equipment will be returned.

Customers who have used Move to Mint certificate(s) who no-show for the flight without canceling the booking before the time of departure will forfeit the certificate(s) and applicable taxes, except where prohibited by law. Certificates and applicable additional taxes will be recredited to customers who have used Move to Mint certificate(s) if the flight is canceled or operated by substituted equipment on which Mint is not available.