What is the preferred lockable single mailbox for postal carriers?

mailbox with slot and lock   Dan mailbox drop slot

Slot bent inward to restrict a hand from reaching in to easily steal your mail Stainless steel machine screw and lock nut included for standard installation

27K Lost mailbox key??! Get a long screwdriver and unscrew latch through slot No Customer lost keys for they mail box lock #mail #mailbox #mailboxlock Combination Lock Mailbox

first slot machine invented year pawn stars As Yelchin got out of his car and went to check his locked gate for mail Anton Yelchin explores extramarital love's time slot in '5 to 7' The SLOT WITH FLAP HINGE AT TOP -TO OPEN IN LETTERS - 0 0 0 0 0 0 0 SPACE FOR COLLECTION SCHEDULL 5 HOOKS FOR MAIL DAG ELEVATION 00 S ' HOLL FOL LOCK D- Top