H1b/h4 travel with previous employer visa stamp

USA H1B Visa
1

I did H1B transfer from employer A in May-2018 to employer B and got approval for 1 year and now got extension approved from B
I have approved I797 from my current employer(B).

I am traveling to India this month and coming back on second week of July.

My visa stamp from employer A is valid till August-2019 but they revoked petition in July 2018.

I have below questions.

  1. Can I enter US with previous company visa stamp? Do I need to go for stamping?
  2. If I need to go for stamping can I do dropbox.?
  3. Does my wife needs to go for biometrics to do dropbox?
2
  1. Yes, you can. Read H1B Stamping after Transfer
  2. No need to, if you enter US before August 2019.
  3. She can do dropbox, if she qualifies for it.