Please help with REF of I485, Thanks a lot!

I got RFE of TST test. I did it and want to send it back to Texas center.

I wnat to send it with overnight mail or FEdex, but the RFE letter I got just has a mailing address of :

USCIS?TSC
PO BOX 852381
MESQUITE, TX 75185-2381

Is there other mailing address that I can send with overnight mail or Fedex?

Thanks in advence!

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