Can you tell me the story of Boss Dharamsee's first visit to Shirdi and how his attitude changed?

Certainly. The story of Boss Dharamsee's transformation is detailed in Chapter 35. He arrived in Shirdi as a curious skeptic, questioning the devotion of others. When Kaka offered grapes with seeds to Sai Baba, Baba began distributing them. Dharamsee disliked this variety and was hesitant to eat them, especially since they were unwashed. His mind filled with doubt, even questioning Baba's sainthood for not knowing his preference. As Chapter 35 narrates, Baba, knowing his thoughts, gave him even more grapes and commanded him to eat them. When Dharamsee reluctantly obeyed, he was astonished to find the grapes were completely seedless. This personal miracle completely changed him; as the text says, "All his ego dropped away, and love for the saint was born."