This is the 3104th most frequent Turkish word.
bulunmadığını
"That it is not present" or "that it does not exist."
The word 'bulunmadığını' indicates the state of him not being present in this scenario.
Toplantıda onun bulunmadığını söylediler.
They said that he was not present at the meeting.
Here, 'bulunmadığını' signifies the absence of the information as part of the context in the book.
Kitapta bu bilginin bulunmadığını fark ettik.
We realized that this information was not in the book.
In this example, 'bulunmadığını' is used to denote that the evidence was not present in the described location.