The law of treasure trove in the United States varies from state to state, but certain general conclusions may be drawn. To be treasure trove, an object must be of gold or silver. Paper money is also deemed to be treasure trove since it previously represented gold or silver. On the same reasoning, it might be imagined that coins and tokens in metals other than gold or silver are also included, but this has yet to be clearly established. The object must have been concealed for long enough so it is unlikely that the true owner will reappear to claim it. The consensus appears to be that the object must be at least a few decades old.