H1B I797B Approval hard copy mail lost

USA H1B Visa
1

Hello Sir,
I transfer my H1B approved petition from company A to Company B.
After 6 months waiting new petition from company B also got approved and company B shared I-797C soft copy.
I asked company B to share the original hard copy of I-797C so that I can book Visa Interview Slot.
After one month, Company B saying that attorney did not received the mail at the same time it was not return to USCIS. The mail was lost.

Here my questions:

  1. Is it mandatory to have original hard copy of I-797C at Visa interview time?
  2. If attorney file an I-824, how long it will take to get the duplicate approval copy?
  3. What is the best way to get I-797C duplicate copy with out filing I-824?
  4. Can attorney track the mail and get the lost package?
  5. Can we use I-797C duplicate copy for SSN and driving license?
  6. what are all the documents will be there in the package sent to attorney?
2

Copy is fine and you xan use it for driver’s license.