I fixed it for you.
Don't make an anonymous complaint. They'll keep your information confidential anyway. Also, try to get some digital photos of the garage the next time he has it open.
I dont know about you guys, but if my bike was stolen and I thought there was a remote chance it/or parts of it was in that garage, I would of walked over right then and nosed around. To hell with if its awkard or not..think of how you felt when it was stolen, who cares what they think...you never see him anyhow right? just be cool.
Ok, who told him you were on to him?
I am going to agree with calling the PD. If you filed a report with the PD, and your bike IS in fact in that garage, god forbid in pieces, then I'm sure you will be filled in. I would call them and tell them, "hey. I think this guy's got a chop shop, my bike was stolen in September and this is what the color, the mods that were done to it..." they might find pieces of it in there." I would call them and call them TODAY!