check, but in my case they would not extend it until it expires, i did call the day before mine did and because they had phone problems and i waited along time, she did it in her file and said she would take care of it the next day.
but when i got my email 1 week later it was only for 1 of the confirmation # and i had 2, so i calle dback and they said she never did the 2nd one. So i don't think they are deleted after expiry, and they told me to wait til they expire