[bombcar]

Those also don't usually allow "package" delivery (think UPS) but maybe something can be worked out. Some small post offices will accept a UPS delivery to "unit PO BOX number" but I don't think they're supposed to.

[PebblesRox]

Some USPS locations do offer a Street Addressing option that allows for receiving parcels to a PO Box:

https://postalpro.usps.com/mailing/competitivepoboxes