That might work if the carpet was installed within a few months after piurchase...I doubt they would be keen to replace if they know it was sitting in a box all rolled up for twelve years.I have had very good response fron ACC if the carpet does not fit right. I have always installed the carpet within a month or so. They have replaced the carpet if my pictures show the problem. And the replacement comes very quick.
Worth a shot to ask them.....but don't hold your breathe. Also try installing a heater in the car with the carpet weighted down. It might help soften the glue backing enough to help get the shape back.....Preferably an oil finned heater - no naked flames or exposed electric element heaters.....no point setting the car on fire.