"It is said that General Tsao became as wealthy as he was because his enemies dropped more coins upon defeat. It is also said coins were magically attracted to Tsao's presence. Now that the helmet belongs to the Cooper Gang, they'll know for themselves if the rumors are true. Also, Murray gets a much needed boost in his defense against a guard's attacks."
It is located in a vault on the roof of the Temple of Anubis. The passwords to get the treasure are "Sand", "Mummy", and "Corona", and the number code needed to get to the vault itself is "5-8-9-9-0".