the incredibly rare notebooks were left outside of the office door with a note that read “Librarian happy Easter X.” These insanely precious items left inside of that pink gift bag are estimated to be worth millions of dollars and they had been missing for 21 years in January of 2001 during a routine check at the University of Cambridge Library it was revealed that a small box containing Charles Darwin’s most valuable notebooks hadn’t been returned to their rightful place in the special collections room these were priceless records of Darwin’s earliest thoughts on evolution including his famous tree of life sketch which was the first visual representation of his theory of evolution by descent from a common ancestor following an extensive search that spanned years the items were officially declared missing by the university in 2020 with a global call out to help find the missing work and 2 years later they showed up on the library’s doorstep and even after a police investigation and the involvement of Interpol the identity of whoever took and return the book still remains a mystery