Some TSA outposts at some airports (Bend, Oregon, I'm talking to you!) have acquired a really nasty habit. When you check in, they’ll want to inspect your gun in their secure area, where you cannot go. They may ask for your keys so they can do this. The problem is that technically speaking, you are violating federal law by surrendering the keys to your gun case to anyone. There is no “exemption” for TSA employees, although they’ll insist that they have the right to do this because they work for the government. Winning that argument with TSA agents while you’re trying to catch a flight is an iffy proposition at best.