A friend, who lives in one of five flats in a house, ordered some stuff from Amazon. It was apparently delivered, as Amazon has a photo of it on the front doorstep of the building. It was not there when she arrived home later, and nobody else knows anything about it. All building occupants are friendly. Is it now lost? Does proof of delivery to the doorstep constitute proof of delivery to the person?
What is her best course of action, to just persevere with Amazon that she never received it, and proof of delivery to the building is not proof of delivery to the person? The driver might even have taken it him/herself.