Ok, I had a rifle misplaced by Delta on return trip just after 9/11. Somebody failed to scan it into secure storage at the airport since I had long layover. When I was getting onto commuter jet to my home, I saw my gear bag and told handler careful with rifle. What rifle was response so I flew home knowing my rifle was nowhere to be seen. It was a long story but after raising hello at airport, I went home. I tracked down SrVP of CS for midwest and sent email. Got call immediately. She took charge and kept me informed. Basically she felt it was there just misplaced. Got call found it in secure storage not scanned and got it on next available flight. This was about a 12 hour search.
Here is best part, I waited up for the special delivery from airport. I saw van pull up and dropped my very large SKB obvious looking rifle case on my front porch snd started to leave. I opened door and asked him what are you doing? Just delivering luggage! I asked him if he knew what the case was? Sure! Rifle case! And you think leaving it on front porch at 12:30 at night without knocking good idea? I didn't want to wake you....
You cannot make up this level of stupidity. I was so mad I called the VP and left message. She was absolutely stunned by it as well. Even the thought of leaving plain luggage is mind boggling.
So asked them to search EVERY secure storage they have since it might be that simple never scanned in so nobody can find it.
Good luck!