If the at fault driver is insured then just a matter of your mate lodging a claim for fair compensation for the value of the loss of the vehicle and maybe a couple of weeks rental car hire with the insurance company. They should just pay out if its reasonable.
If the at fault driver is uninsured then he will simply have to go down the NCAT path and take his chances on recovery of funds.
I've used these lawyers to represent my interests before in damage recovery. All they do is vehicle accident property loss claims, they are NOT injury ambulance chasers. If the other driver is insured and its a cut and dried "not at fault" incident they will do all the leg work at no cost to your mate.
https://ahmetlawyers.com.au/
I'm sure they can operate in NSW. Worst case they might be able to point you towards a lawyer who can.