Well, "seize" = court order or a police action. If police shows up to seize something then you can either cooperate (hand it over voluntarily) or risk addition

Well, "seize" = court order or a police action. If police shows up to seize something then you can either cooperate (hand it over voluntarily) or risk additional penalties (fines, prison time, ...). I read this story as "law enforcement was able to figure out that they have bitcoins, so they knocked on their door, and the criminals opted to hand it over instead of prison time". So yes, they transferred it, but I wouldn't call this voluntarily. It's just that the applied force is as visible as the seized bitcoins.