Courtney Fullilove, assistant professor of history, wrote an article titled "Dead Letters—By a Resurrectionist: Liberty and Surveillance in the Tombs of the U.S. Post Office," published in the January 2012 issue of Common-Place.org. In the article, Fullilove describes a history of the 19th century Division of Dead Letters. Until World War I, all undeliverable letters were processed through the central office in Washington. By law, unclaimed letters were burned, pulped, or otherwise destroyed. But Fullilove discovered this wasn't the case. "Here was a riddle," she writes. "In a non-existent box were four letters that should have been destroyed. Their presence was evidence…