http://www.stgeorgeutah.com/news/ar...an-redwine-criminal-investigation-new-photos/
If you notice the link I posted above, there's a large mailbox, and two regular size mailboxes next to each other, and further to the right there appears to be some type of wooden structure that could indicate a third mailbox, so the dirt driveway leads to at least two houses with a possibility of a third, so even if the house for sale / lease is vacant, the other may or may not be occupied.
If you notice the other pic in front of the Fathers house, his mailbox is attached to a pole sitting in a five gallon bucket in front of the truck, so there's mail delivery on both sides of the street.