If you are worried about theft, I think you are best served by just removing it. Kind of like when you see a store at night - they just leave the cash register drawer open to signal no money. I had these un-cuttable locks on a box trailer - the stupid thieves destroyed the door mechanism and the skin of the door to get in -- but the locks were just fine
I am now of the opinion that if someone is set on taking something, they are going to do it and I just need to keep the physical damage down to a minimum when they do. Obviously removing some of the more valuable targets is really the best way to go.
Sad...but that is where we are....