H4 EAD receipt dint come,mail person missed ,it returned to USCIS office

Hi
I applied H4EAD,mail person missed the mail I am living in same address past 6 year,when I was tracking I saw USCIS mail,I was waiting for that mail,but finally it dint come to my mail box,I called the USCIS agent,I gave my husband H1 petition number so from that I got my receipt number,when I checked the status by using the receipt number it showing that document returned to Uscis office,I did e request still I dint get any response so how I can get my documents.