The courier doesn't know what will happen to the delivery address.

This kind of situation is basically rare. On the recipient's side, if you see the address is unclear, you will generally not ask for it, and you will not help you deliver it by courier.

If the courier's address belongs to the super area, it is not delivered by the courier company. There are two ways to deal with it. The first one is to contact the recipient to pick up the parcel himself, and the second one is to contact the sender to modify the reachable address.