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A bit weird and invasive for your carrier, less weird if its a camera facing the box from a tree, at least then its not an upclose unflattering angle. They also make a device that sends a chime inside the house when its opened.

Weird? No. Legal? That‘s trickier. Does USPS own the mailbox or do you? If they own it then no. Do you have an HOA? You should check with them on surveillance rules. In most states, it’s OK to aim a camera from inside your house to the mailbox.