How to remove embedded mailbox in wall?

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mailbox slot cover adjustable-through-the-wall-mail-drop-slot This Mail

mailbox slot for door MAILBOX LETTER SLOT swinging door wall mounted cast iron neo classical antique vintage old mail postal · Item details · Delivery and return policies · 7,151 This through the wall mail slot is designed to accept standard mail, rent payments, or small parcels It can be used as a payment drop slot for rental offices