Keep the artifacts as they are
Returning treasures to their original context is unfeasible; too much has changed physically and culturally over time for them to speak more clearly in their country of origin than they do in museums, where they can be compared to large assemblies of objects from a variety of cultures. In the advanced world of the 21st century, looting and stealing artifacts should be eliminated altogether — even for the sake of preservation, but the returning of already acquired artifacts should not be expected.