I would knock on neighbors doors and say look if you know these punks here is the warning next time its the sheriff that's going too be knocking it has too be neighbors. I had the same problem and come too find out they were raising dope on my hunting plot that was just a acre plot at my parent's 4 acre thicket. It was neighbor kids I waited them out with my pistol and coon hunting light one night, lol you should've seen their faces when the spot light hit them and pistol pointed at them. Never had trouble since.