Dozens of stolen ancient artifacts that belonged to U.S. billionaire Michael Steinhardt were recently returned to Italy, the Manhattan District Attorney’s office said. Steinhardt, a former hedge fund manager, was once among the world’s most prominent collectors of ancient art. Steinhardt had bought the looted items, including statues and ceremonial vessels, without seeing evidence of their provenance, investigators said.

The announcement follows a years-long investigation into Steinhardt, who avoided charges after he surrendered 180 artifacts, worth an estimated $70 million, and agreed to a lifetime ban on acquiring antiquities.