It has long been stated that the best way to keep something secret is to hide it in plain sight.
                             This structure is made of approximately $400 million worth of pure gold plates. 
          Thanks for safekeeping it till my return but I'll be needing my gold now to help pay off this national debt.
If anybody is claiming this to belong to them, rather than to myself, let them step foreward with their counter claim or forever hold their peace.