I had trouble sending a bundle of legal docs by courier to my son's PO Box in Abu Dhabi.... from NZ.
My lawyer must have convinced his courier of the requirement to use a PO Box for Abu Dhabi.
Apparently Abu Dhabi (and maybe the rest of the UAE) does not have property numbers on streets.... but they are working on it!
Apparently the courier people know how to find a physical location based on a PO Box number.
The UAE (and most of the middle east) doesn't have street names like the rest of the world. There are areas, which may or may not have street numbers. Apartments will be in a building name/number but not have a street. It's is all very confusing.
If you have a private po Box your mobile is associated with it via Emirates post. Courier drivers will just call and ask for a WhatsApp pin.