Overdue Book

Overdue books are a recurring item throughout The Commonwealth of Fallout 4. When one is returned to either of the two book return terminals in the Boston Public Library the player recieves five book return tokens. The tokens can then be exchanged for a variety of prizes. The most notable of which is a copy of the Massachusetts Surgical Journal.

Locations (incomplete)

 * Six of them can be found distributed throughout the Boston Public Library.
 * One can be found down the stairs at the East end of the main room of Trinity Church, located at Trinity Plaza.
 * One can be found in the laundromat in Lexington, next to the diner.

Book return terminal prize list
This is a complete list of all prizes available from the Libraries' two Book Return Terminals.