In holes what does stanly discover in the gully?

In "Holes" by Louis Sachar, Stanley Yelnats discovers a hidden, abandoned suitcase in the gully. The suitcase, which is rusty and old, belonged to a notorious outlaw named Kissin' Kate Barlow. Inside, he finds treasures and items that connect to his family's history, particularly a valuable gold lipstick tube. This discovery plays a crucial role in unraveling the story's mysteries and the significance of the cursed Yelnats family fortune.