None of those exist any longer...
AS for Italy returning antiquities—where would one return the four horsemen residing in St. Marks’s snatched so brutally from Constantinople in the 13th century?
http://jssgallery.org/Essay/Venice/San_Marco/Basilica_San_Marco/Four_Horses.htm
So, those horsemen should be returned to Istanbul, no problem. Is that what YOU were referring to?