Years ago I used to keep my tools in the trunk of my car. Among those tools were a complete set of Snap On, ¼, ½, and ¾ drive ratchets and sockets & deep sockets. Well, I came out to my car one morning, and lo and behold my car was no longer there.......it was stolen! I was more upset about these stolen tools then the stolen car.
Therefore I suggest that you don't leave your expensive tools in your car. I now leave some basic crappy tools there. ;)