This guy definitely has to be an [H] reader. It doesn't even matter if he caught the thief, you know he scared the hell out of them.
The man rigged an empty box with a microphone and a car alarm that was set to only go off if the box was opened. He took it to his local UPS and 10 minutes after dropping it off, he says the alarm was tripped when someone opened the box. He also claims that microphone picked up the sound of the package being opened.