But I think what actually happened was someone somewhere else in the Canadian gov't saw a news interview and told SpaceX.
The space law experts I talked to agreed that since SpaceX has now asked for it (assuming it *is* SpaceX), the farmer has to surrender it. BUT he should ask for compensation.
If there had been damage, the US gov't would have had to compensate the Canadian gov't, but because it's a private company, and no damage happened, compensation is voluntary
I chatted with the farmer again, and he's doing everything right! He asked for proof that the person was from SpaceX. He asked them to donate to the local skating rink. He's being careful at every step. He's doing a great job of dealing with a totally bizarre situation that very few people in the world have ever had to deal with.
I'll be heading up to visit him and see the junk over the weekend once I'm back in Sask, he seemed pretty confident that he'd still be in possession of it.