回复USCIS的RFE,可以用Fedex的快递寄到Potomac Service Center吗?

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tili
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opt延期申请,收到一封USCIS的request of initial evidence信

要求将employment letter寄到
Potomac Service Center U.S. Citizenship and immigration services
2200 Potomac center DR STOP 2425
ARLINGTON VA 20598-2425

要求用给的信封
Please use the enclosed envelope to mail the additional evidence requested back to this office.

可以用Fedex 快递吗?
还是必须用USPS?

之前递交申请的时候,用USPS和用Fedex寄到的是两个不同的地址,且两个地址都不是Potomac Service Center
不知道Potomac Service Center 必须用USPS,还是Fedex也可以。


谢谢!
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