Seems like they could just drive through a neighborhood and look for unoccupied houses... The lowlifes that are breaking into houses to steal stuff to pawn are probably many cards short of a full deck. Lock your doors, set your alarm, and keep a gun handy while you're at home...
Since I got a new Jeep that I intend to keep the top off in the summer I may get a lockbox welded to the frame for valuables I want to leave in it.