As far as Black Budgets, I think we'll never know where the money comes from,but I have a guess! Check out S.A.I.C.
Fort Knox is a United States Army post in Kentucky south of Louisville and north of Elizabethtown. The 109,000-acre base It currently holds the U.S. Army Armor Center, the U.S. Army Armor School, and is used by both the Army and the Marine Corps to train crews on the M1 Abrams main battle tank. The history of the US Army's Cavalry and Armored forces, and of General George S. Patton's career, can be found at the General George Patton Museum on the grounds of Fort Knox.
The United States Department of the Treasury has maintained the Bullion Depository on the base since 1937. This facility is operated by the Treasury Department and is independent of the Army's operations there.So I guess the Treasury Dept. keeps track of it, LOL
http://en.wikipedia.org/wiki/Fort_Knox