I would be very interested to see if it came out that the officer unlocked the car somehow. I have a hard time believing someone in the city would leave their car unlocked, though mistakes do happen. Either way if it was locked or not it doesn't look good for the officer.
Also there seemed to be quite a number of other trucks, SUVs parked on that street and i'm curious why he decided to search that particular one. It does have a FOR SALE sign on it, but that doesn't seem suspicious to me.