It depends on the yard. If a tow company and not a Police lot they can sell after the lean sale I have bought 6 this way the tow yard gave me a amount for the vehicles and the leinsale docs stated the dmv fees needed to register up to date . wrecked vehicles were a little different.(Bought for parts) I had to finish DMV fees before removing cars. If police impound, some have contracts with auction houses to sell at auction. I have been to these and most have a 10 to 15% auctioneers fee on the selling price and they will also state DMV fees needed so if car has back fees you will pay at the time of auction.