FBI actually does what ever the hell they please, anything they cant do public they have mercenary agents for...
The article says that the guy was arrested by Garda Siochana, which is the Irish police.
So unless the Irish police are dumb (which is also a possibility), the coins stay with an Irish court.
Otherwise I foresee an interesting diplomatic issue arising very very soon.
hopefully they do try to fight for the coins
this would be so Fing bullish news.