Clearly something happened to the former owner of the box, Daniel J. Christainsen from the Netherlands, but who lived in Florida, that was very memorable as almost all the drawings of UFOs, aliens and winged beings including transcripts are very detailed and large.
Below some of the strange drawings. The complete set of 102 images: Here
The drawings remain a mystery!
Complete set of 102 images at http://imgur.com/a/uCSg1