Based on the introduction to the Satcharita, what do we know for certain about Sai Baba's birthplace or family background?

The introduction in Chapter 0 states that reliable information regarding where Sai Baba originally lived or who his parents were is not available. However, it does confirm that he had a significant connection with the Nizam's territory (Monglai), frequently mentioning towns like Selu, Jalna, and Pathri. The text recounts an incident where Baba's detailed questions to a visitor from Pathri suggested special knowledge of the place, but it explicitly states this is not certain proof that he was born there. Similarly, it could not be determined if he was Brahmin or Muslim by birth, or even 'unborn' as some devotees believed.