Get a python lock or some snake lock, you can drill the holes slightly bigger to get the cable through, be careful to only take enough plastic to get the cable through, that way you can lock them. I also highly recommend the trail cam mounting system you screw in I have one fro all my cams it is much easier to mount and you can also run the cable through the and around the tree to help even more. That being said the cable will still be going through plastic so if someone really wants it they can break it off and then they will have a broken camera. I suggest trying to put the cams in areas people normally dont look