Strongbox

Noun

 * 1) A sturdy box with a lock for keeping valuables in.

Thesaurus
Fort Knox, bank, bursary, cash register, cashbox, chest, coffer, coin box, depository, exchequer, fisc, gold depository, locker, money chest, penny bank, piggy bank, pork barrel, public crib, public till, public treasury, public trough, repository, safe, safe-deposit box, storehouse, strong room, subtreasury, till, treasure-house, treasury, vault