Ouch, same thing happened to me two weeks after I finished restoring my Triumph TR3A (1982). The Lady in the station wagon got mad at me for sitting there not moving (and getting hit)..... at a red light! Go figure, she must have been color blind. Her collision insurance paid.
Then it happened to me AGAIN last year in our Grand Voyager, waiting at a yield for cross traiffic to clear.... bam. The police were there in two minutes, made out a report, and his insurance paid. In both cases, I had to go to get estimates for repair, and then argue with the insurance company 'till my chosen repairers estimate and theirs "met". The police report was very important as it assigned guilt. In your case, even if the kid was not insured, your insurance company (if you had to use the uninsured driver part of the policy) would go after whoever they could to get their money back, in this case, likely the owner of the car. It's good to hear the other side is paying.... this will make life much easier.
Remember Mopar those parts manuals you down loaded..... now would be a good time to look at the one for your car! No foam in the the rear bumper, it has a fiberglass absorption piece... it is likely crunched.... I seem to recall it's not cheap, had to buy one for my project. Only way to see if it is broke is to peel off the rear facia. It is possible that is all the damage other than the Viper applique' (which is around $60)...
Now for the hidden things to look at, if it got hit squarely (even not very hard), it is possible the right rear frame rail got tweaked a bit, you'll need to get the frame measured to find that one..... If he hit you hard enough to move you, I'd bet it's bent.... a 5-10 mph hit will bend things
Next, open the trunk, and remove the spare tire. look in the latch area, and the trunk area were the spare tire fits, and the flat floor for cracks..... again, repairable.... but only way to get back to pre-crunch is a rear inner structure, you do not want to go there as everything from the doors back has to come off to replace the rear-inner structure.
You have my #, feel free to give me a call.