I've heard stories about miracles in Shirdi. How did people know if they were real? For instance, how did the man named Dharamsee confirm his experience was a genuine miracle?

The account in Chapter 35 addresses this type of skepticism through the experience of Boss Dharamsee. He arrived with a 'clinical scrutiny' and was initially put off when Baba offered him grapes with seeds. His internal monologue questioned Baba's abilities. The miracle was confirmed for him through a direct, personal, and verifiable experience. The grapes Baba gave him were miraculously seedless when he ate them. To confirm this wasn't a coincidence, as described in Chapter 35, Dharamsee then asked another devotee, Babasaheb Tarkhad, about his grapes. Tarkhad confirmed his grapes did have seeds. This contrast made Dharamsee 'extremely surprised,' shattering his doubt and proving to him the unique and personal nature of Baba's power.