Protests against the sale emerged on social networking sites last week. An online petition was organised by the Nigeria Liberty Forum, which describes itself as a "UK-based Nigerian pro-democracy group".
"They should seek good counsel and refrain from selling the mask," Orobosa Omo-Ojo, an official in the state government of Edo, which contains the modern city of Benin, told the press in Nigeria. "Anything that makes them ignore this call [from] the Edo state government will [make us] use this as a starting point to protect our intellectual properties."
This demonstrates that Sotheby's is responsive to concerns over long-standing cultural property issues.