I had the same situation happen to me, cept they took a large axe.. and smashed my windshield and back window..
how did I know who it was? I was being followed one day, and I knew it.. so I flew and parked at my gf's house.. they pulled in looked at my car and drove off, so I left to the city with her parents came back and saw the damage! nobody knew where she lived but those thugs
so the whole real men don't pick fights? I'm sorry I'm 20... most people on here are what ? 30+... I went over there, and beat the livin piss out of the one guy right at his house, then went to the OTHER guys school during lunch and beat the piss outta him, also gave his car a nice dent

call me imature all you want, but after that I have never been bugged ever again... it solved my problem instantly, I don't need police to help me fix things by writing a statement down and thats about it, I did all the police work myself (brought the axe to his dads work, he confirmed it was his axe without knowin what his son did) bam went looking for him, finished the job.
hey thats just my way of dealing with crap! oh and before you mention.. I did get 500 bucks out of one of the kids.. for the damage, scared him about the axe information, lol he thought he was gonna go to jail!
point to this ^ SAV? I say you should go lookin for him confront him, make it look like you knew what he did.. see what he says, then work your way from there... ask him why he did it etc