E3 visa "Employer change" approved through online. IF travelling with USCIS DOcs. What are the options?

I am on E3 visa, Changed my Employer and did it online and took 6 months for approval.

My wife travelled to Inida with the approved documents from USCIS.

What is the scenario?

DId she need to go stamping carrying the original USCIS DOCS?

Any drop box option for E3 visa holders?

If she is going of Interview, how to mention that she is for here for stamping?

Or can she travel without even going for stamping or drop box carrying the USCIS DOCS?

What are the options ?

Please let me know.