I missed something.

In your original post you said the car was the Owner's Daughter's.
In the update you say the Drivers Mom went by to look at the car.

Is this guy related to the Owner?

As far as what Mom said I wouldn't worry. She wasn't there and therefore can't testify, except to say "My Boy is a Good Boy and Never Did Anything Wrong" and we all know "Good Boys Always Tell Mom the Truth". There should be physical evidence of his spin.

Also since she went by apparently Mom had some kind of permission. I doubt the shop would let just anyone rifle through a wrecked car. If he truly didn't have permission or if they were considering criminal charges I'd assume the local LEOs would be all over it.

Good Luck and don't get too bogged down in this. I hope this all works out for you soon.