"The First Federal Post Office in Ridgefield was established by an Act of the Second Congress of 24 October 1791, by authority of the first Federal Postmaster General, Timothy Pickering. A copy of the Act, handbooks of regulations for the guidance of the postmasters, and circulars signed by Pickering are preserved among the papers found in the Keeler Tavern.
The first United States Postmaster in Ridgefield was Colonel Philip Burr Bradley, who served from 1792 until 1805. Colonel Timothy Pickering visited Ridgefield and stayed at the Keeler Tavern, according to contemporary accounts, and it is possible that the visit was official, for the purpose of inspecting the post office, which was maintained in the front room of the Keeler Tavern from 1792 until about 1830."
"A comprehensive collection of the records of the first Ridgefield Post Office was recently presented to the Ridgefield Library and Historical Association by Miss Emily Gilbert. Among these are the record books listing persons indebted for postage, and records showing the volume of mail for the period during which the post office was maintained in the tavern."
In checking the online catalog of the Connecticut Historical Society they have the following post office books:
Hartford 1767-1777 and 1781-1788
Chesterfield 1801-1904 and 1898-1904
Tonight I sent an email to the Keeler Tavern Museum, asking for information about the post office books: