Jonas, I have seen them put locks on the CMC rails in the past (probably about 4 or 5 years ago). Far worse things have happened at that rail then TGR hitting it. One of my buddys put a chain around the concrete post at the bottom and pulled it out with his truck. That didn't get it locked. It is just luck of the draw if you get busted and it gets locked up.
But here's what you do...
Cut the the chain off (bolt cutters, blowtorch, whatever), but don't hit it that night. Wait like two weeks so most of the people forget there ever were chains on it, then go hit it. This solution has worked before and will work again. Also, you can't get in trouble for cutting the chains off if you go back later.