On july 23rd my case status changed to " Notice was returned to USCIS as post office could not deliver it". I had already received the receipt by then. I called up USCIS to know if its biometrics appointment notice. To my surprise they said my fingerprints are received on july 8, my receipt date. I have not given my biometrics at an ASC atleast since last year. However, i returned from India on june 24th and have given my fingerprints at POE. Not sure if that would suffice, or if i will have to wait for biometrics appointment.