This is more fully covered with legalese in Derek Fincham's blog (where I picked up the story), so I will just signal the next development in the unusual case involving Iranian antiquities in the US:
Chicago's Field Museum of Natural History and the University of Chicago's Oriental Institute won a victory on Tuesday in their efforts to maintain possession of thousands of ancient Iranian artifacts. In a ruling, the U.S. Court of Appeals for the Seventh Circuit reversed a lower court's order that might have handed the artifacts over to several American victims of a 1997 terrorist bombing in Jerusalem.
(David Glenn, 'U. of Chicago and Museums Win Key Ruling in Legal Battle Over Iranian Antiquities', The Chronicle of Higher Education March 29, 2011)