What are the initials on the object Stanley found in the book Holes?

In the book "Holes" by Louis Sachar, Stanley Yelnats finds an object with the initials "K.B." engraved on it. This object is a mysterious gold lipstick tube that plays a significant role in the story's unfolding plot and connections between the characters. The initials lead to the discovery of the history behind the family and the curse that has affected Stanley's family for generations.