Parents must inform the Agent that you are using a passport agency to expedite the processing and that the sealed documents will be hand-delivered to the Department of State. This Department of State policy is called "Hand Carrying of Executed Applications". The policy is detailed on pages 31 and 44 of the Acceptance Agent Manual.
The Acceptance Agent should write the child's name, departure date, and the date of birth on the outside of the sealed envelope. If two or more applications are sealed in the same envelope, please make sure that the information about all applicants is written on the envelope.
The acceptance agent will return the sealed envelope to you. Do not open the envelope. Mail the sealed envelope along with remaining paperwork to VisaHQ for the processing of your child’s new passport.