How to remove embedded mailbox in wall?

Linon Rio 4 Slot Wall Mailbox 45 H x 14 12 W x 4 34 D Copper 4 slot mailbox Net Weight, 205 lb Number of Doors, 24 Orientation, Horizontal Post Height, 13 Post Material, Aluminum Post Thickness, 12 Slot Capacity, 10-34 W x 40 hot & cash slot Revamp mail convenience! Our 4C Horizontal Mailbox, double column, features 9 compartments and an outgoing mail slot for streamlined organization

44 pg slot Mix and match the three sizes of mailboxes to get the right number for your class size The slot sizes are 1-34H x 10W x 12-12D Recycled and recyclable