I came to US in October 2014 on H1 and have not visited India to get my visa stamped. My wife (H4) went to India in May 2017 and my visa was due for extension on 31/12/2017. She got the dropbox facility and got her visa stamped in june 2017 with visa expiration date of 31/12/2017. I again got visa extension till 31/12/2018 and the recent one till 30/11/2019. Is my wife still eligible for dropbox?