I became confused the moment I saw the episode "Namaste" in which Sun and Frank traveled to the Barracks in 2007. The Barracks had been abandoned for three years, but there were remains of the DHARMA Initiative such as the "Processing Center" sign, the DHARMA logo on the door of a house, and the photos of the recruits. Is it just me, or shouldn't this stuff have been disposed of after the Purge? I don't remember seeing that sign anywhere during any previous episodes showing the Barracks, and I don't remember seeing any logos on the houses. Does seem like a mistake, or is it just unimportant?