How did Sai Baba's detailed knowledge of a theft prove his omniscience to one of the visiting guests?

As detailed in Chapter 36, one of the guests was astonished by Sai Baba's all-knowing nature. Baba recounted the guest's personal story of a theft with perfect accuracy, without ever having been told. He described how a trusted Brahmin servant of thirty-five years had made a hole in a built-in wall cupboard by moving stones while everyone was sleeping. Baba even knew the exact value of the stolen bundle of notes, which was thirty thousand. This precise knowledge of an event that left the guest crying day and night convinced him that Baba was miraculous.