HELP NEEDED USPS Prepaid return shipping label

[coolbhai]

Hi All

I am applying for "renunciation of Indian citizen ship/passport" via postal to
BLS International USA
4239 Geary Blvd,
San Francisco CA 94118

I got my US citizenship (naturalization) on May-23-2013.
I got my US passport issued on July-07-2013.

Prepaid return shipping label
- You must provide a prepaid envelope along with your application so your documents
can be returned to you once your application has been processed.
A copy of the return shipping label or prepaid envelope is also required.

DOES THIS MEAN A XEROX COPY OF THE RETURN SHIPPING LABEL OR PREPAID ENVELOPE

- The prepaid envelope return address must match the home address as given on the
proof of address.
Do not provide a handwritten or manual UPS or FedEx air bill.
Airbills with credit card information, handwritten airbills or
blank airbills with information typed in cannot be used by our office.

- We strongly recommend using a traceable airbill generated online from FedEx or UPS.
We also recommend that your return shipping package is insured.
Indian Visa Application Center is not responsible for any damages or missing documents.
No compensation for damages is available.

WHAT DOESE TRACEABLE AIRBILL MEAN IN UPS.

Thank you in advance