Although there is no eFiling for I-539 - 回複:回複:pjiang, radiology

I think you can register an account at USPS, then print a pre-paid shipping label for Priority Mail (flat rate envelope) which costs $4.60.

There is a date printed on such shipping label which will qualify you to the lower fee.

https://ecap-ws-prod.usps.com/entreg/login.do

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