They don’t out here-if the shipper you ordered from ships with UPS or FedEx, that is whose truck comes through your gate and down the driveway to your deck/porch-out here USPS does not go inside fences/gates onto private property-they only leave your stuff at the mailbox/ outside of the gate. I suppose handing it off for the last mile works in a less rural area, since the houses are right on a street or less then 100 ft or so from the street-and no gates or long driveways-also, postal carriers in rural areas are all local people who are contract labor who drive their own SUVs and pickups, unlike in cities-rural postal carriers don’t walk, either on their routes-the properties are mostly acreage-too much distance. Some neighborhoods have central mailbox arrangements at their entrances, but not many-they are theft magnets...
Hmmm rural route carriers here are postal employees and either drive their own vehicle or a postal vehicle. And here(Iowa) is pretty rural. And they drive right up to the farm house to deliver packages. Must be different there. But here the USPS is required to service all addresses as required by law. UPS and FedEx are not. Hence , they drop ship to the local USPS to finish delivery, thereby saving themselves time and money. At the USPS expense