The discovery of these two sculptures was not purely good news for Leonard Ethan, because according to Italian law, anything found on one's own property belongs to the homeowner; however, the government insists that the homeowner must preserve and maintain the cultural relics, and they may be inspected at any time.
In other words, the artifact belonged to Leonard, but he could only sell it to a museum designated by the Italian authorities. If he chose not to sell it to a museum, then he would have to bear all the maintenance responsibilities and accept inspections unconditionally.
In fact, many European countries have similar laws, which is why many nobles or descendants of wealthy families choose to sell their cultural relics; after all, maintaining them is very expensive, and not something ordinary people can afford.