You are 18, yes? I am about as sure that you have friends who knew about your grow, as you are that it was your neighbor. Could be anyone. If you are 99% sure it was your neighbor, I would get a disposable cell phone and call 911 to report that you were jogging by (insert his address) and say a naked young girl ran out screaming and a man ran out after her and dragged her back inside. They will search the shit out of home. If he has it, they will likely find it. You won't get it back, but you will get revenge.
Who knows, maybe he does have a young girl captive in there.