Can you recount the story of how Chand Patil found his lost mare with Sai Baba's help?

Certainly. According to Chapter 5 of the Shri Sai Satcharitra, a man named Chand Patil from Dhup village had lost his mare and searched for her for two months without success. Disappointed, he was returning home when he encountered a Fakir, who was Sai Baba, resting under a mango tree. The Fakir asked about the saddle Patil was carrying, and upon hearing the story, simply told him to go search near some streams. As Chapter 5 narrates, Chand Patil went there and immediately found his mare, which made him realize he had met a great saint or 'Avaliya'.