Earlier quoted context omitted.
> He was under no moral obligation to fix Nintendo's mistake for them. I'm not convinced this is true (well it may be true morally but I don't think it's true legally). IIRC duplicate shipments are not considered Unsolicited Goods and in the UK you are legally required to inform the sender and return them if the sender requests. Edit: This article[0] seems to suggest the same, but the Citizen's Advice link is broken.…
Who is responsible for the cost of returning the goods?
I believe it's the sender.