I just had a similar problem today. My truck came with a tractor supply company tool box, but no keys for it. I called tractor supply and they called the company that provides them with the locks I believe. I think its gonna cost me about $20 to get a new set of keys shipped to my house. It would be a little cheaper if I wanted to drive to tractor supply(45 minutes) to pick it up. I bet you could put a new lock on yourself, or get a key from a locksmith alot cheaper than that, but I just went with my first option instead of running around… My lock has numbers on the front, so I just gave them those numbers, dont know if you have the same.