It took ten seconds to Google the UK equivalent, and it seems to be the same rule. Unsolicited goods, which are defined the same as the FTC' s definition, seem to be treated the same:

https://www.saga.co.uk/magazine/money/spending/consumer-righ...

Read further and you'll see that if they're sent by accident you're obligated to arrange their return at no personal expense.

But that means that they cannot force you to stay home waiting for a courier. He could've asked them for a return label to send it back. Refusing to stay at home for a day because of that is valid as it should constitute a personal expense (no lawyer).

Yep. He could have said "I'm only available to hand over the parcel to a courier on Saturdays 9am-5pm or during week days between the hours of 6pm and 9pm" and they have to figure out how to collect it in those hours - it's their problem essentially. And if they did take him to court they wouldn't have a leg to stand on, since he has shown willingness to return the item.

Yeah, threatening him with legal action was absurd.

The comment I was replying to was talking about the US.