The immense outpouring of archaeological discoveries this past century has shed new light on ancient East Asia, and China in particular. Yet in concert with this development another, more troubling, trend has likewise gained momentum: the looting of cultural heritage and the sale of unprovenienced antiquities. Scholars face difficult questions, from the ethics of working with objects of unknown provenance, to the methodological problems inherent in their research. The goal of this Element is to encourage scholars to critically examine their relationships to their sources and reflect upon the impact of their research. The three essays in this Element present a range of disciplinary perspectives, focusing on systemic issues and the nuances of method versus ethics, with a case study of the so-called 'Han board' MSS given as a specific illustration.