What is the story behind the Sai Baba portrait that Kakasaheb Dixit saw before his trip to Shirdi?

The portrait Kakasaheb Dixit encountered has a special history detailed in Chapter 51. This photograph originally belonged to Megha, a devoted disciple who worshipped it as if it were Lord Shankar. The glass on the portrait had broken, so it was sent from Shirdi with Balasaheb to Nagar for repairs. After being fixed, the portrait was kept covered in Mirikar's drawing room. It was as if it was waiting specifically for Dixit. Balasaheb unveiled it just before Dixit's departure, and seeing the image of the one whose darshan he longed for filled Dixit with extreme delight.