Receipt Number with MSC

Butterfly_Azul

Registered Users (C)
I recieved my reciept notice for my EAD. My papers had been sent to TSC. Does anyone know why my reciept number begins with the letters MSC and not with SRC?
 
is you case family-based as opposed to employment-based?
Most family based cases are processed at the Chicago facility (receipt #'s start with MSC)
 
Yes it is family based. Another thing is that when I go to the USCIS website to check status of ap it says case cannot be found. It doesn't even give MSC as an option only some other letters.
 
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