The number of pieces of notes issued is of interest to collectors because it is a key determinant in the value of the note. Fewer pieces of an issued note translate to greater rarity, and higher value. For the Orchid and Bird series, the government disclosed the total number of pieces released. However, midway through the Ship series, the numbers were no longer disclosed. Instead, the government only provides the total value of notes and coins in circulation, without specifying the numbers for specific denominations. This is for financial security. If people know exactly how many pieces were printed—for example, how many $1000 notes were issued in a certain year—it may help criminals track how much cash is in circulation or spot which notes are harder to trace. This could make it easier to plan illegal activity, such as money laundering or large cash movements, while avoiding detection. By keeping this information confidential, it becomes harder for anyone to exploit the system for unlawful gain.