I think that asks questions of either the delivery driver or the neighbour he got to take it in. Surely they must realise that he would write down what address it was left at (if he did leave it at another address) and therefore can't just deny knowledge of taking it in. If it's the driver then he risks his job if someone doesn't receive an item and he falsely signs it as delivered to another address.
Mind you it may be that you have to walk a little further down the road to find your lamp as we've had a delivery taken to a house 10 doors away as they were the only one who answered the door when he knocked
