That's weird Jeff. On my several trips, using an aluminum case like yours, I had a couple of keyed master locks on my rifle case instead of TSA locks. I was told that I should be the only person able to open that case, not some bunch of idiots who all had TSA keys while I wasn't present.
This is correct. TSA Locks are ILLEGAL on firearm cases. If they want to open it, they have to come to you and you open it, or once it's gone down into the bowels of the luggage world, if they want to open it, they must contact you and get the key.
