You're likely referring to the series of unfortunate events by Lemony Snicket. In the book "The Bad Beginning," the Baudelaire orphans find a room under the trunk of a tree on their Uncle Monty's property.

However, the question of what they *didn't* find is a bit tricky. The book doesn't focus on listing everything they *didn't* discover.

Instead, it focuses on the things they *did* find:

* A secret room

* A collection of rare and valuable herpetological specimens

* A map leading to a mysterious island

* A series of clues related to their parents' disappearance

So, the Baudelaires didn't find many things in the room, as they were more focused on the intriguing objects and secrets they *did* uncover.

If you have a particular object or category in mind, let me know, and I might be able to give you a more specific answer!