《明史·志·卷五十》
呈元年只是设一人，后增加二人。掌管宝玺、符牌、印章，而辨明其使用范围。
掌宝玺、符牌、印章，而辨其所用。
Only one person was commissioned in the first year of Chengyuan, but later two more were added. They were in charge of the imperial seals, tallies and seals, and defining the scope of their use.