When my Claude Gordon Benge and my tuner and all my music were stolen, along with a cooler with food, they were in the back of the car hidden under a blanket (we were traveling, and there was no room in the trunk). The thieves used a coat hanger to open the door, left the hanger on the floor of the car under the passenger seat, and relocked the car when they left.
We were among many at the police station with others who had had similar experiences, other than the part about the thieves locking the car afterward. The police said that in their experience the trumpet was probably on its way to another part of the country and that it probably wouldn't turn up locally. It has not been found, and it has been decades since the theft.