EEK! Thats not good.
Try blowing into the back of the driver VERY gently. Put your mouth over it an give the tiniest puff of air. Exhale 2-3cc, if you can imagine that. Very little air. Just enough to pop it back into place, but not so much to tear the driver off of its mounts.
After that, if there are still creases - Repeat the following procedure with a little bit of 3M post-it note and then scotch tape (the gentlest you can find) followed by more agresive scotch tape in order from "you're crazytoast" to "OMFG-WTF-YOLO"
Take a piece of adhesive tape and cut it down to a good sharp point.
VERY VERY gently press it into the crease.
Pull it out.
You should feel VERY light tension as you pull the tape out, and HOPEFULLY the dents will pull out with a minimum of effort.
Start with 3M post it notes.
Hopefully one of these works.