I was just recently in an accident.
My seat appears fine and there was no child in it at the time of the crash.
However, all techs have confirmed that because I was in a crash with enough force to give my neck whiplash, the seat cannot be guaranteed safe any longer. (And I just bought the damn seat a week before!)
I am going to call Graco, however, and see what they say as well. They know the seat the best.
My car would probably pass the "test" spoken of above...the seat was in the middle and I was not hit in the door. I drove home in the same car. I did go to the ER later, but with whiplash injuries. No airbags went off...
However...cars can also have hidden damage, just like seats can. My frame is likely bent, and the car will be totaled. This was from just a rear-end accident, too!
There is a good chance that your friends seat can be replaced by the insurance company involved...assuming he claimed it as property in the accident. Was a cop at the scene? Cops should ALWAYS note if there are child seats involved, as they are considered safety devices for the vehicle AND your property involved in the crash.
Your friend should call the carseat company!