FOR THE FORM-~3806 OF THE USA-DOMESTIC-REGISTERED-MAILING(USA-ONLY) IS WITH THE REGISTERED-NUMBER &: DATE-STAMP AS THE [RE]CEIPT/BILL OF THE LADING-EVIDENCE OF YOUR MAILING. FOR THIS REGISTERED-MAILING-NUMBER IS WITH YOUR SEND-PERFORMANCE.
Form 3806 is part of the USA-domestic-registered-mailing(USA-only). This form contains the Registered-number and a date-stamp as the evidence of your mailing. It is your [re]ceipt/Bill of the Lading. This Registered mail number (copy of your envelope) is what you will send to Chief.