Did Baba ever visit his devotees in disguise, and can you provide an example?

Yes, Baba certainly visited his devotees in disguise, a powerful example of which is found in the story of a devotee named Dev. As recounted in Chapter 40, Dev invited Baba to an Udyapan ceremony. Baba promised to attend with two others. On the day of the feast, a Sanyasi arrived with two companions, and Dev served them a full meal but failed to recognize that the Sanyasi was Baba himself. Baba later confirmed this, stating, "I said I would come with two others, and I went with two others... do you not remember the Sanyasi's guise?" This incident illustrates how Baba could be physically present yet remain unrecognized by his devotees due to the veil of Maya.