or if you lived in communal flats/apartments and were stood in/passing by the post box room when postie arrived you could claim to be the OP and sign for/nick his new phone.
Yeah, or I could walk up to a postie in the street, ask if he’s got anything promising, and then tell them that I’m the person with the name on the address label of that…
The scenario you’ve described doesn’t need ID, it just needs the postie to do his job and put the parcel into the box, or deliver to the person behind the door of the specific flat, rather than handing it over to a random person in the communal area.