Question 16 is: (c)9 AND you filed your Form I-485 with the USCIS Chicago
Lockbox facility, and your receipt number begins with "MSC".... (see
instruction page 9).
-This is for the family based (I-130) I-485, not yours.
Check on Page 10 in the I-765 instructions for EB I-485 based EAD filing address.