I hope the postman isn't annoyed. We had a storage box but needed a gap in the wall as we have a glass door. Two identical parts, one inside, one outside. My son cut through the wall and lined the hole with a patch. Vinyl siding on the outside, plaster on the inside. As someone else said, fragile mail (like a cardboard flyer) probably won't get through as the doors are fairly tightly locked. Let's see how it holds up over time. The exterior is very pretty and looks great on my interior wall.
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