That sucks. I build my own trailcams, if I lost one it would be like losing part of myself. I would think seriously about an empty box "decoy" with an IR cam up high looking down. Like 15-20 feet, blended in well. It would be hard to get to, even if the guy knew it was there, take your steps out once you get it up. He's probably not coming in during the dark, and even so, IR flash is hard to see if you aren't looking at it. Nail his hide.