The problem with no_username's response is, provided what the article says is true, the founders of PirateBay do NOT OWN the company. "According to Global Gaming, Seychelles-based Reservella actually owns the Pirate Bay." Therefore, the IFPI, at first glance, do not have any entitlement to claim the money from the sale of TB because it would be a sale by Reservella. IFPI sued the founders of PirateBay, with a corresponding judgment entitling them to money from that suit. But they didn't sue Reservella.
Now, what they could still do is hold Reservella responsible for the PB's actions, and try to get the money via a lawsuit that way. But even there, that's a farfetched plan that USUALLY wouldn't have a leg to stand on. But reading the articles pertaining to The Pirate Bay vs IFPI case, the entire process has been illogical, so why shouldn't another IFPI lawsuit?