I was checking in at the first-class desk in DFW last month. The friendly agent saw my bose case draped around my neck and asked if I had my name inside. I told her I did, and she informed me that "most of the ones that get turned in don't have any identifable information inside." I expressed surprise that any would actually be turned in, since I wouldn't expect to get them back if I forgot them. She assured me that many, many get turned in, but without any name inside, they can't be returned.