Even actual reputable auction houses auction stolen antiquities or lots with dodgy provenance information. They don't care at Christies and similar houses. For

Even actual reputable auction houses auction stolen antiquities or lots with dodgy provenance information. They don't care at Christies and similar houses. For example: https://www.christies.com/lot/lot-5546862/ https://www.christies.com/lot/lot-5546862/ Also don't forget eBay, plenty of stuff to find there too