Fixing damage from exploded can

Okay, so I have a funny story to tell you guys. I've been doing my yearly detail of my prius. Got the exterior washed and waxed, buffed out a few minor scraches, detailed the engine compartment, then all the rubber bits, cleaned the leather, you know the whole works. Part of that was vacuming and using some compressed air to do some dusting.

Well... In the end everything looked great. I had a little more to finish, so I left the can of compressed air in my cargo area so I could finish after work today....

Then went to lunch and came back and the can had exploded! It was strong enough to shoot the can through the side wall of my cargo area. Through the carpet, the cardboard like hardstuff, and the insulation, only to be stopped by the wheel well of the car.

Any ideas on how to remove/repair the piece? I'm thinking pick-a-part, order a new part from toyota, take that piece out and fiberglass over it and recarpet, ideas? I'm trying to laugh , but I really want to scream! :mmph:

Does anyone know what part number this might be or what the name of it would be? Left side rear cargo area wall? Something like that? Thanks!