I don’t see that this has been pointed out in this article or in the comments section here, but the common mailboxes you will find in US residences are solely f

I don’t see that this has been pointed out in this article or in the comments section here, but the common mailboxes you will find in US residences are solely for the use of USPS and the resident. It’s a federal crime for a courier like UPS or FedEx or Amazon to deposit things inside them, or indeed for you to pop a note to your neighbour if it is not affixed with postage (of course nobody cares about that). Most homes could easily do with a lockable (non-mail) delivery box, and I doubt that drones are going to drive adoption of that... I must say though, I vastly prefer the mail slot that is found in the U.K. and rest of Europe far more commonly as a model.