You won’t receive any hard copies of anything from NVC they communicate via email only. It’s your job to make sure they have an email for you on file. Emailing them will not give you a quick response which is why I suggested calling them instead. To make changes to the immigration process is not an overnight instant thing. It’ll take many years, the only thing that can quickly get updated is versions of documents. The same thing my fiancé thing many others did before him and the process has not changed. I don’t go off “what if” or doubts I go off faith and it has worked for me so far.
When submitting P3, you just send back the checklist, DS-160 confirmation w barcode, and biographical page of your passport.
Here is a list of everything I brought to my K1 interview. I bolded the things they actually took at the interview.
Intent to marry letter (fiance's only, not mine)
Confirmation page of DS-160
A copy of the letter that the consulate sent via e-mail
Proof of interview payment
Appointment confirmation
Passport and copy of biographical page
Proof of fiance's domicile in the U.S.
Utility bills
Copy of US fiance's status in USA
Passport biographical page
Birth Cert.
Copy of long form birth certificate
Police check
Affidavit of support (I-134) with all supporting financial documents.
Statement from an officer of the bank or other financial institutions with deposits, identifying the following details regarding the account: (1) Date account opened; (2) Total amount deposited for the past year; and (3) Present balance
2018 Tax return and W2s
Contract
Paystubs
401K and Roth IRA statements
Evidence of relationship
Photographs
Boarding passes/bus tickets
Phone logs
Two recent, colour, passport-style photographs
Medical-examination results in a sealed envelope
NOA2
