How was Kakasaheb Dixit's meditative vision of Vitthal doubly confirmed?

The confirmation of Kakasaheb Dixit's vision of Vitthal is a wonderful story of Sai Baba's omniscience, found in Chapter 4. The first confirmation occurred immediately after the vision. While meditating after his morning bath, Kakasaheb saw Vitthal. When he later went for Baba's darshan, Baba surprised him by asking, "Vitthal Patil had come, right? Did you meet him?" and playfully warned him to "Nail him down and make him steady." The second confirmation happened that very afternoon. A person from out of town arrived with twenty-five pictures of Vitthal of Pandharpur to sell. To Kakasaheb Dixit's amazement, the image in the pictures was an exact match for the form he had seen in his meditation, reinforcing Baba's words. Deeply moved, he purchased one of the pictures and installed it for worship.