Last minute questions before interview

[cookie y cookie 1]

My fiance has his interview tomorrow morning and I'm so excited!! I just want to make sure that I clear up these final two questions beforehand:

1) I remember seeing that originals are required to bring to the interview so I mailed all original documentation required (e.g. W2 forms, NOA 2 approval, letters/envelopes in the mail). My question is...do the originals of those items truly need to be submitted or are they just for back up? I already sent copies as well but I want to make sure my W2s and the NOA 2 approval doesn't stay with the consulate because I will need them later. (I'm not sure if the answer varies by consulate..this is for Argentina)

2) I finally moved into the apartment where my fiance and I will be staying. I know that I'm supposed to update the address for our case but where does the address change request need to be submitted? USCIS? DOS?

Thanks for all your help for the past few months! We're finally in the home stretch...and on to the next race