I recall John Doe being said to be Canadian and the son of a doctor, disinherited from the family. If this is true, I doubt he is on a missing person registry. I thought about the ego doctors have, and what it would take for one of them to do that to their kid, and poured through the Royal College registry of Canadian doctors to find ones whose initials (from the ring - going on the assumption that John Doe had a family name or variation of, possibly a junior) and possible dates match up as being a parent of John. It's harder for me to find more specific information on these folks without having access to Canadian resources, and I haven't asked any Canadian friends for help yet. If anyone is interested in this list (I was going to see if any list having a kid earlier in life then no or fewer children listed later to start with) let me know.