The nineteenth century French antiquarian Eugène Boban is most famous today for selling fake Mexican antiquities to collectors: the “crystal skulls” that have enchanted everyone from the British Museum to Indiana Jones. But what of the <i>real</i> skulls he sold? Smithsonian anthropologists Jane Walsh and David Hunt take us inside one of them, which may or may not have belonged to a fearsome bandit from mid-nineteenth-century Mexico.