My fiance worked for a movie theater in the DC area for a while. Once she found, left on the floor, a packet for an Afghanistan diplomat program put on by the US State department. Big itinerary with lots of names, dates, contact information, not just for the various stops and talks but for the people selected for the program. Nothing classified or obviously sensitive, but I'm sure someone with the interest could run through those contacts and come to a lot of conclusions about the US's foreign policy goals in the region. Or to follow these up-and-coming Afghanistan diplomats around on their trip to the US and maybe grab some blackmail.