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My lawyer gives the exactly same explanation i.e. we have the return receipt as proof. My argument is- Let us assume that INS misplaced the docs (since there are no updates yet), how will they even know that we replied. Their system will "probably" pick up after 90 days are over that we have not responded to RFE.
So far, we three are together, who responded to RFE around May 10 and have no updates yet.