thinking outside the treasure box

Yeah...so an article on CNN.com (content provided by Mental Floss) actually uses "Treasure Box" referring to a female pirate of the 19th century who happens to be the "most successful pirate of all time", whatever that means...

Thinking outside the treasure box
Although clearly ahead of her time, Cheng I Sao was shrewd enough to realize that the pirate masses weren't likely as enlightened. So, her first act as leader was to make her husband's second-in-command, Chang Pao, official captain of the fleet.

While Chang Pao led the men into battle, Cheng I Sao focused her attention on business, military strategy, and the enormous task of governing a growing body of ruffians. In the years following her husband's death, she steadily brought more and more outlaws under the banner of her Red Flag Fleet.

Girl pirates, regardless of the size (or skill) of their "treasure box" don't make good pirate movies....ask Johnny Depp.