If U go personaly, they will take I94??
This is what I learned from our lawyer, If you apply EAD/AP by post then they take only copies of I94 but if you go personally, they will take original I94. I am not convinced and don't want to get stuck with this issue when my 485 get approved and I go for stamping.
BTW I have original I94 stub for my personal record that comes attached on the lower left side of your renewed I797 ( H1B).
-- Bandu