New York State Police Troop K in Putnam County is cautioning that there's been a continued trend of vehicle break ins and thefts.  Troopers are offering common sense crime deterrent advice--locking unoccupied cars, taking keys and not leaving vehicles running when unoccupied.  Vehicles are being stolen largely in part because victims have kept their vehicle unlocked, with the keys in it.  New York State Police say most of the vehicles that unlawfully leave a traffic stop involving State Police are stolen from the area.