Updated July 3 at 9 a.m. with a response from Facebook.
In 2013, an American collector visiting Tunisia entered the Sousse catacombs — an ancient necropolis that holds some of the oldest Christian burials in the world — and stole a skull with a "very dark ancient patina" (as he described it) during renovations of the catacombs. The collector put the skull up for sale in a private Facebook group for $550, telling his tale of looting in the sales listing.