What are all the original documents signed by san huang in Buddhism?

That's the Taoist system, which can be downloaded from the folklore website or the Taoist system website. There is no such thing as drawing lots in traditional orthodox Buddhism, but there are such folk customs in places where there are many exchanges with Taoism, but they are usually confined to Taoist circles, such as signing Guanyin. The three officials are heavenly officials, local officials and water officials. It is a Taoist immortal system and has nothing to do with Buddhism.