I-485 sent on Aug.4 to NSC, receipt still mot received yem193982007-09-18 21:11:04

Hi,

I sent my I-485 petition to NSC (I live in CA) on Aug.4, up to now, I still did not receive the receipt. How can contact with them ? Has anybody received the receipt who sent out the I-485 form in that period of time ?

Thanks !!

别急呀,多数同学sent on 7/2,7/17,不也才刚刚收到receipts吗。