Thefts from cars are crimes of opportunity. The thief sees something and grabs it. I once had a police officer friend demonstrate what is often used and how fast it happens. He had a ball bearing on rubber band. Pull it back a couple of inches and bang out goes a window. A thief can be in and out in under 15 seconds. Very hard to see happen. They also use escape hammers.

More sophisticated ones use lock pick tools and other devices. One of our maintenance guys had the tools because of work needs. He could get in and out of things in no time at all.

The point is, even with all the security in the world you may not see it in a parking lot. Your best defense is leave nothing visible.