Can you tell me the story of Boss Dharamsee and the grapes from the scriptures?

Certainly. Chapter 35 recounts the story of Boss Dharamsee, who visited Shirdi with a skeptical, 'clinical interest.' A devotee named Kaka had offered grapes with seeds to Sai Baba. As Baba distributed them, Dharamsee was internally conflicted because he disliked seeded grapes and was concerned they were unwashed. He even questioned Baba's sainthood in his mind. In response, Baba gave him more grapes and commanded him to eat. Upon obeying, Dharamsee was astonished to find they were miraculously seedless. This profound experience, as detailed in Chapter 35, caused his ego to vanish and replaced his skepticism with deep love and devotion for Sai.