Not that anyone has said anything incorrect re: the expiration, but don't certs disappear from the 'unused cert' section after being applied to a reservation (pre-stay)?

That is how I remember it...

They take your points at reservation and return if cancelled...pretty sure it works the same for a cert.

I would call MR and see if the reservation is still valid and how it is being 'paid for'...but I imagine it has expired.