I'll be the first to admit I'm not much of a thief so I have to ask how did they manage to steal it? Were his keys in there too?
Side note: I almost had a heart attack one morning last summer when I went out to go to work. My truck was sitting in the road and not in its normal spot on the drive way. I then remembered that I put it there to get stuff out of the garage. I also used my second set of keys to move it. They were still in the ignition switch, doors unlocked and all. An easy grab for a thief.