Elisabet says it belongs to her and her family, and that sounds right to me ... but we're talking about a huge amount of money here, even after Dagny takes her share. Real-world experience suggests every government that thinks it might have a claim will try to snag some or all of it -- Iceland, Holland, maybe even France and England. In fact, considering the fighting that's going on right now about exploration rights in the Arctic, maybe we should include Russia in that list too.
Still, that's the real world. Here in Nancy-Land, Dagny gets her finder's fee, Magnus gets his ship, and the people of Skipbrot throw off centuries of small-minded xenophobia and start being friendly to the would-be murderer in their midst.