USCIS sent the whole packet back because I forgot to sign the I-129F form. I feel so dumb. They sent the packet back immediately via USPS and it was sitting in my mailbox for at least a week. I rarely check my mailbox, because I hardly receive any other mail.
USCIS has put some kind of stamp at the bottom on every page. The stamp is very long with various numbers. I wonder if I can re-send the same packet again, or will I have to re-print all 50+ pages again. Does anyone have experience about this. I am thinking of calling them tomorrow