H1 to H4 Transfer, Submitted documents but no reciept number

[Ven]

I filed my H1 to H4 transfer documents to USCIS 2nd August 2013. I haven't received any receipt number so far. USCIS already charged $290 check which was sent with transfer documents.
How and when will I receive my receipt number and status information from USCIS?

Thanks..!!