Stolen cams/feeders

Out with a buddy on his lease this weekend checking his cams and filling feeders we've discovered that he's had another feeder and camera stolen. This makes two feeders and 3 cameras. 3 sides of his property is private owned, he knows them and they have a pretty good relationship. One side of his property Is public hunting. He's seen a few messicans hunting the public land frequently. He's getting pretty pissed and not sure what to do. Suggestions?