Could not find Robert Moore on NAMUS or Doe Network. He was found in March 2011 on an island in St James Park, 100 yards from Buckingham Palace. He had been there for around three years and left the US in 2007
http://www.dailymail.co.uk/news/article-2044588/Queen-obsessive-Robert-Moores-body-lay-100-yards-Buckingham-Palace-3-YEARS.html
http://www.dailymail.co.uk/news/article-2044588/Queen-obsessive-Robert-Moores-body-lay-100-yards-Buckingham-Palace-3-YEARS.html