I once left a jacket on a plane. I completed the paperwork online a couple hours later. The next day, I was back in the airport, DFW, and checked with baggage claim. They knew nothing. Three days later I was getting on a moving sidewalk in DTW and ran into one of the FAs from the flight where I left my jacket. It turned out she had found the jacket and given it to the ground crew who should have turned it into baggage claim. We called and were told the jacket had been shipped to ATL. Long story short, the jacket was never found, heck, I even checked out the store in Scottsboro, but...
A woman in ATL baggage claim told me to get labels, which I did, showing my name, phone number and email address. When they find items, they look for those. My computers, computer bag and anything else I might lose now has the information and it's sewn into every inside suit jacket and winter coat pocket so they can get in touch with me.