What was written on the suitcase Stanley and Zero found in the hole?

The suitcase that Stanley and Zero found in the hole had the initials "KB" written on it. This suitcase belonged to Kissin' Kate Barlow, a notorious outlaw from the area’s history. Inside, they discovered valuable items, including a treasure that connected to the story of Kate Barlow and her past. This find played a significant role in the unfolding of their adventure at Camp Green Lake.