1836 8 Sept. A large pass door key, an iron padlock key, and an iron safe key, either lost or stolen.
1894 ‘M. Twain’ Pudd'nhead Wilson xix, in May 22/1 His plan was, to..steal the safe-key..and then go back and rob the safe.
1992 D. Robins vii. 62 Mark tried to persuade Steve to hand over the safe keys.