So I ordered some BXP1 upgrade certs about 3 weeks before my broker's honeymoon to upgrade his seats. Reserved the upgraded seats but never got the certs. Called up 2 days before the flight and, after about 15 minutes, AA was able to put a note in the system for my bro and he got upgraded without incident. A few weeks later, and the certs finally arrived (more than a month after the date on the letter).

My question is, what are the odds I can still use these certs? I don't want to put some upgraded seats on hold and show up to the airport to have them not be accepted and my MCE coach seats gone.