While no Greendale School exists in New Jersey, a school in the Greendale suburb of Harare, Zimbabwe, is informally known as the Greendale school.It's actually named for a white Rhodesian fighter Courtney Selous - and the Rhodesian commando unit Hatfill joined was called the Selous Scouts.
The article correctly shows that Greendale alone means nothing. However, it leaves without comment the assertion that Hatfill served with the Selous Scouts. If he did, the connection between "Greendale School" and Mr. Hatfill becomes a bit less tenuous, indicating either that the letters were designed to frame Hatfill or Hatfill's actual guilt, and counterindicating mere FBI sloppiness in turning up suspects.