dragonbeast: if you ever meet the thief here is what you do:
run at them while staring forward
pull out a longsword
yell: "STOP RIGHT THERE CRIMINAL SCUM, YOU VIOLATED THE LAW"
then somehow confiscate everything he has ever stolen, even things noone knew he stole
That reminds me of a RPG-Con I was at a few years ago. It was next to the city park and deep at night we heard a cry for help from the park. So we went to see if we could help. The quickest one of us called back "Hey, a bunch of skinheads are harassing someone" loud enough that everyone on the con heard. ... and in the next moment about 150 people in armor, armed with swords and whatever, came running.
I've never seen Skinheads run so fast! Unfortunately they had a head start, because they had heard the call as well. So we didn't catch them. But at least we had saved the homeless guy who had called for help and we have given the bad guys quite a scare.
Moral: if you want to harass someone, don't do it next to a large group of people whose hobby it is to play heroes. :-)