回複：I also called USCIS, the woman said GC is the most important.

Thanks.

I got three e-mails from USCIS

1) I got the first e-mail saying "Card Production Ordered"
2) second e-mail saying "Welcome Notice sent".

We received the GC and the Welcome notice in 3 days later.

At the same day
3) We got the third e-mail from USCIS saying "Approval Notice sent". But I never received this "Approval Notice"

So I would like to know what is the "Approval Notice"? Whick form?