Drop box appointments availability at Hyderabad


i am planning to visit india during June-July timeframe. i need to book drop box appointments for H1 and H4 visa renewal at Hyderabad. Anyone who has recently booked drop box appointments at Hyderabad ,can you tell how does the availability look for those months for drop box appointments at Hyderabad location ? are there free slots showing up or is it too early to view the appointments for those months ? is there any way to check drop box appointment availability with out paying the fee ?