I-824 approved, but didnt receive official letter due to moving

can somebody help to tell me how i can do ? i got email from USCIS , they said, I-824 approved, the letter has been sent out, but i have not received any letter so far almost 20days passed, I also changed my mailing address online and got Reference No#, in this situation, how can i do ?
i am not sure how is the following procedure to process I-824 finalized

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