回复:今天(7月29日)寄出I-131从UPS, 移民局按旧费或新费收?谢谢回答。

you have better to call UPS to make sure how they deal with it. FedEx accept drpoff but the date will be marked as Monday( July 30), with which CIS will ask the new fee.
Pjiang said you might try the USPS and here is the link to his post
Although there is no eFiling for I-539 - 回复:回复:pjiang,

good luck

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