A dead-drop is terminology for the package of secrets that a spy leaves for his case officer. This cache is located in the same park that convicted FBI spy Robert Hanssen left and retrieved some packages for his handlers.
"After sending the Soviets a coded note, Bob Hanssen made good on his promise, dropping off his package of secrets in Nottoway Park, a recreational area, which happened to be across the street from the Hanssen’s first house in Northern Virginia. A few days later, the KGB responded by dropping off $50,000 in $100 bills at the same drop site." -- CrimeLibrary.com
While there is no cash in this cache (at this time anyway) there is an assortment of spy related merchandise.
Please be discreet retrieving and replacing this cache since this is a popular recreational area.