Unfortunately, I'm pretty darn sure that it is illegal to post anyone's name, address, phone number, etc. with out their permission.
However *look around to make sure no one is peering over my shoulder* you could go up their and sneak into their house during work hours so they aren't there and place a bug in their phone that only transmits radio waves every 4 hours so any phone lines are not likely to pick up the signals. Then you go home and call him asking for your helmet and assuming he does the same thing as the last time then his wife will probably ask who just called and he'll start talking about the helmet where you will be able to pick it up with your bug and use it as evidence against him. MWAHAHAHAHAHA.
Note: this is actually illegal as well =(
However *look around to make sure no one is peering over my shoulder* you could go up their and sneak into their house during work hours so they aren't there and place a bug in their phone that only transmits radio waves every 4 hours so any phone lines are not likely to pick up the signals. Then you go home and call him asking for your helmet and assuming he does the same thing as the last time then his wife will probably ask who just called and he'll start talking about the helmet where you will be able to pick it up with your bug and use it as evidence against him. MWAHAHAHAHAHA.
Note: this is actually illegal as well =(