I sent my reply to a RFE to "UCIS, Attention: Adjustment of Status. 850 NW Chipman RD, Lee's Summit, MO 64063" but USPS informed me it was delivered to a PO Box at Lee's Summit MO 64081.
Did my paperwork go to the wrong address? What can I do to make sure my paperwork was delivered? Should I upload the same things I sent to my UCIS account online?