It appears that Upasani maharaj, baba's contemporary, knew of Sai baba in moon long long ago.
In his composition The Sainath Mahiman Stotram (Sada Nibavrikshasya...), he has stated something similar,
शरत्सुधांशुप्रतिमप्रकाशं, कृपापात्रं तव साईनाथ ।
शरत्सुधांशुप्रतिमप्रकाशं - uncomparably beautiful bright light of moon in the autumn (शरत- autumn सुधांशु- moon अप्रतिम- uncomparably beautiful प्रकाशं- bright light, bright shine)
कृपापात्रं - reservoir of grace
तव - your
साईनाथ- o Sainath
O Sainath, the reservoir of your grace is just like the uncomparably beautiful bright light of moon in the autumn
Now Upasani maharaj has talked about autumn season (sharad ritu) i.e. precisely September to December. It seems that he knew that the moon during this time closely resembles Saibaba.
|| Om Sai Ram ||