It seems to me that most cars sold have the wheel lock keys somewhere with the spare tire and jack. One could put it in the glove box or central console too. But these are limited and well-known locations. Wouldn't a wheel thief be willing to open the trunk (using a crow bar or through the window) and get the key to take the wheels? Is the lock itself enough of a deterrent? Or do you have a better hiding place for the key?