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?