What about body art like scarifications, traditional tattoes, reduced heads or trophy heads ?
To go back to our initial subject, about stolen artpieces and their return, all this reminds me of an interesting anecdote about the Nok terracotta from Nigeria.Few were bought completely illegally few years ago by the Louvre Museum before its ethnologic collections were transfered to the Quai Branly Museum, in Paris.The whole story is told in a very interesting article of the serious french newspaper Le Monde, translated in english and published on the website of an american university. Here is the link:
https://listhost.uchicago.edu/piperm...ry/001122.html