Why is money called box?

Excuse me, but I'm quite puzzled by the phrase "money called box." Could you please clarify what you mean by this? As far as I'm aware, money is not typically referred to as a "box" in any common financial or cryptocurrency context. Money is generally defined as a medium of exchange, a unit of account, and a store of value. Could you possibly be referring to a specific type of financial product, service, or terminology that I'm not familiar with? I'd be happy to help you understand the matter further if you could provide me with some additional context or information.