strongbox

"They" had not thought that this little dwelling-place was a strongbox and that it had flat bolts, both vertical and horizontal.

Amazed by the boldness of his former employee, Mr. Parker immediately examined the contents of both his desk and strongbox.

So he kept it in his strongbox, where he thought it safe from prying eyes.

As for the Landgrave, there was a cool million in bullion in his strongbox.