answer:If the invoice has your neighbour’s address on it (which seems to be what you’ve said), then wouldn’t it be more appropriate to complain to the company that sent the cassettes? I mean, it’s dickish of your neighbours to take your shipment, but the true fault lies with either the company (if they wrote the address down wrong) or with the shipping company (if they read the address wrong). Also, I am guessing it would take a long time for the company to receive and process a package “returned to sender.”