How did Sai Baba use the incident of the lost shoes to prove his omniscience to Hari Kanoba?

Sai Baba demonstrated his omniscience in a very specific and undeniable way for Hari Kanoba, who was a seeker of miracles. According to Chapter 49, after Hari Kanoba's new shoes went missing, Baba orchestrated their return. He sent a boy carrying the shoes on a stick with precise instructions to call out, 'Son of Hari, gold-bordered turban.' The boy was told to only give the shoes to the person who matched these two distinct identifiers. Hari Kanoba had to prove he was Hari's son and show his gold-bordered turban to the boy. This proved Baba knew his name, his father's name (Kanoba, a form of Krishna/Hari), and his specific attire without being told.