How long it will take to receive receipt/notice for H-1 Transfer

I submitted all my H1 transfer documents on July 11 for premium processing. Just checked with bank, check has not been cashed. Is this normal? I didn't send certified mail, only priorty mail. Lost mail? How long it will take them to cash the check? and how soon they can send me a receipt and how soon get result? My current H1-B will expire on August 14. Worried...

Anyone who recently did transfer please share your experience with me. Thanks.