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对于I-407, USCIS 会寄receipt notice吗？我父母三月份材料寄出后，没有收到任何东西。所以想问有没有查询的途径？再次感谢

-Normally they do not send you the receipt notice because the case process takes very less time to be approved. If you want to inquire the case status, you may send the inquiry by mail to the USCIS Lockbox where your I-407 was filed.