What does a bucket of gold mean in fortune telling?

Probably refers to a fortune-telling book. During the Gan Yong period of the Qing Dynasty, Daxing Literary Prison burned almost all the ancient folk fortune-telling books, leaving only three, of which the first one was called a bucket of gold; The other two books are called Three Stores and Five Finger Umbrella. A bucket of gold is also called plum, which probably means: cut off the bad and leave the best, which is very precious.