Thanks ginnu for your reply !
I called DC office and DHL office to track my package.
I spoke to the mailroom in my office and showed them the copy of my airbill.
He told me that I used incorrect shipping form in my return envelope.
------- you can update DHL with airbill to send the Passport to correct address, you need to discuss with them , if you paid by your credit card show your ID and credit card to them. I dont know if they will help or not but if they dont deliver it to you then it will go back to DC and DOS may send to your address as on the DS-156 or you MUST provide them your passport # name, DOB, when it was sent, so that they can find out your returned passport and can send with regular mail to you. it should be done when you think that your Visa stamp has been done from DC you can visit other threads related to the date when they are recived PP or when they sent PP for Visa stamp and when others recieved PP back from DC. if you feel that your Visa may still not be stamped and passport may be still with DC then also better update them by fax or letter, provide each and every info so that they can track your passport.
So,do you know what DOS will do if send incorrect shipment form or with no stamp on the return envelope?
---- you were supposed to provide then return envelope with your address on it if you wrote incorrect address then it will go to incorrect addrees and then it will be returned to DC office.
Thanks again !
Bala