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Interesting but also seems like something that'll be a bit problematic to work with when vandalism happens. The sensor is right outside the box, it'd be better

Interesting but also seems like something that'll be a bit problematic to work with when vandalism happens. The sensor is right outside the box, it'd be better if that was recessed and harder to see/access (I can see these little black dots getting little dabs of paint). But, tbh, I don't really see the utility of this over equipping the postman with a scanning gun (or even phone) that does the same thing. You might still want 4g and solar panel, but I'd use those for a "there's something at this box" and not "let's scan it to let people know it's on the way".

OJFord 2y ago
Postmen already have them if you've paid for postage online and requested collection. Post boxes in the UK are not like US mailboxes, these are communal and for outgoing mail only. Postmen (typically, exception per first paragraph) only being your incoming mail, and it goes in a letterbox in or near your door, almost always depositing the mail inside your house; there's no way for them to reach outgoing mail you've left there.