I wish I could just search for this, but I'm posting from my phone bc the batteries in my mouse are dead and at the moment I'm "iced" in as we just had a storm in Dallas! But something I always think about is the fact that many of these unidentified probably worked, and paid taxes. Would it be possible for the IRS to release list of people who paid taxes, and suddenly stopped? I know it would probably be a lengthy list, and many may have simply stopped working therefore stopped paying taxes, but I think it could put names to people who are possibly missing. Does a list like this already exist?