I Want To Kill Someone.
Sorry man that is disgusting!! Best thing like you said to do is to put up reward posters....pay the snitch off in weed or $$$ or whatever it takes. They are probably teenagers and we all know that they cant keep a secret, so it will get out eventually. Keep plastering the posters up, and I would go to the highschool and see if you can put some up there! Yep i'd say time to break out a deadly mix of Charles Bronson, Chuck Norris, and some George St. Pierres for good measure!!