July 2nd filer, EAD approved, no I-485 receipt yet

I had my I-485/EAD/Ap filed on 7/2, at TSC. Today, I got my EAD card. in the approval notice, a receipt number starting with SRC is mentioned..is this the I-485 receipt number? however I haven\'t got I-485 receipt notice yet. don\'t understand how this happend. anyone in the same boat?