He and Jenkins had duplicate keys to the desks, letter-box, etc.
But if the note should not be in the letter-box, what would happen then?
It was not in the letter-box; it was not upon the person of the dead man.
Will you write down a message and leave it in his letter-box?
I know him, Lieutenant,—pardon—Monsieur Henri—a—letter-box—a go-between.
It fell into the letter-box ...