British Records: General Post Office Archives
The archives of the General Post Office include various records relating to the postal service in the colonies.
Financial: Treasury Letter Book
The series POST 1/10 includes items relating to packet boats in 1776.
The series POST 48/4 includes items relating to the land postal service in North Carolina.
Staff: Nomination and Appointments
The series POST 58/1 concerns the appointment of deputy postmasters general for the southern colonies.
The series POST 59/16 concerns the deputy postmaster general for the southern colonies.