Is it possible that no clerk mentioned what s/he is working on to a spouse? That no spouse with the information mentioned it to a parent or friend, even accidentally? That no parent or friend let it leak to a sniffing journalist or day trader in the community? With an aggressive press corps dying for a scoop, well-connected within the community of people that work in and around the Court, doesn't it seem surprising that a secret could be so well kept?Perhaps it seems so amazing in contrast to the way other things have leaked — notably the many national security leaks from the Obama White House. Another way of looking at this picture is with the template that everyone is probably doing what they really want to do. Nothing is actually an impressive feat of maintaining secrecy. People can keep secrets. We're surprised when they do only because of the rarity of wanting to keep secrets.
Just an alternate theory.