2,600 undelivered letters, 600 of them unopened, were found inside this postmaster's trunk. ©Signed, Sealed & Undelivered Team, 2015. Courtesy of the Museum voor Communicatie, The Hague, The ...

Young people throughout SoCal are receiving mysterious letters offering "an important opportunity" for summer jobs. It's selling knives.

The trunk's contents include more than 3,100 undelivered letters, of which 577 were unopened and letterlocked. Known as the Brienne Collection, the letters were written in Dutch, English, French ...

The trunk from the Hague in which the undelivered letters and postmaster’s administration were kept in the 17th-century (© Signed, Sealed & Undelivered Team, 2015. Courtesy of the Museum voor ...

That's what a historian at Yale is discovering as she examines, what she calls, "a postal treasure trove" - letters from late 17th century that were recently discovered in a trunk in the Netherlands.