gcar!
Gcar,
As oracleoracle summed it up pretty well, no need to panic. Your receipts are on the way. By the way, Minneapolis Local INS issues EAD in one day. I do not know about the repercussions it will cause, if you apply for EAD with Local INS when you have an EAD application pending in NSC.
I would rather wait for my EAD from NSC.
Good luck my friend.