Salvage auto auctions, sometimes called insurance auto auctions, are usually open only to licensed auto dealers. One of the sources for cars at Interstate Auto Auction are salvage cars. Salvage cars, are cars that have been involved in accident. Interstate Auto Auction makes it easier to check on the history of a car, by providing the vehicle identification number (VIN number) of the autos for sale, so you can get vehicle history reports on the cars that interest you before the auction.