When passport is to be submitted

USA L1, L2 Visa
1

Hi,
After interwiev for B2 visa I was handed yellow 221g ,only passport to be submitted.when should I submit the passport.The interview was couple of days back.
Thanks
Dev

2

You can support it anytime now. You can go to one of the dropbox locations with the letter and passport.

3

Thanks Saurabh for taking out time to reply.