I've noticed a number of SC-816 radios being sold on Ebay without the 4-digit theft code. People are buying them. I thought you needed to know the frame number from the car it was installed in before Volvo would tell you the theft code. Otherwise, if the Volvo dealer is willing to tell you the security code for any radio you walk in with, it's not much of a theft deterent. These are presumably coming from wrecked cars, but you would think the wreckers would know enough to get the frame number.

Are the people buying these radios off Ebay simply trying every possible code until they get the right one?