There is trunk. The trunk once belonged to Simon de Brienne, a 17th Century postmaster. The trunk is full of old letters, some of which have never been opened. The trunk was donated to the The Museum voor Communicatie in The Hague in 1926 and was recently rediscovered.
Now there is a project, Signed, Sealed, and Undelivered, in the process of digitizing and archiving the contents of the trunk. Even better is that you can see items from the trunk. Clicking away on their website is like spending hours in the attic going through forgotten things. I am smitten. I am overjoyed by this. Here are some of my favorite pictures from the archive, but do go check it out yourselves.