You can consider getting an I-551 stamp and also submitting another replacement card if you are unable to locate the lost mail.

Have ever applied for an immigrant visa to obtain permanent resident at a US Embassy or Consulate.?

The general answer is yes. You must answer questions truthfully and accurately.

An F-1 may create an LLC, but they may not work unless they are legally authorized to work. It is possible to be involved as a passive investor...

Can i marry someone from outside the USA if i am approved for asylum ?

Once you obtain legal status from your asylum case, then you will become eligible to sponsor a family member.

What is the best strategy for husband wife with approved I140 in EB2 but priority date current in EB3 in oct 2020 bulletin ?

It would be possible to downgrade from EB2 to EB3.

My PD and Oct 2020 visa bulletin?

I agree with my above colleagues. Keep in mind that there is a presidential proclamation that bans immigrant visas until at least 2021.

Can 2 companies file my H-1B visa while I'm already working for a company ?

Two separate companies can file an H-1B for you.

You may be able to amend during the interview. An officer will inquire into why it had been provided earlier.

Affidavit of support for change of status?

Take a look at the I-864P. It will depend on how your household size is determined. Consult with an immigration attorney to assist you throughout...

Will we be able to use filing date or it will be the final action date for I-485 filing?

It appears the filing date is being used.