lockbox

from WordNet (r) 3.0 (2006)

lockbox
    n 1: a fireproof metal strongbox (usually in a bank) for storing
         valuables [syn: {safe-deposit}, {safe-deposit box},
         {safety-deposit}, {safety deposit box}, {deposit box},
         {lockbox}]

from The Collaborative International Dictionary of English v.0.48

lockbox \lock"box`\, n.
   A box of strong and durable construction, fitted with a lock,
   used for the purpose of protecting valuable items, such as
   money or jewelry; a strongbox.
   [PJC]

[email protected]