Number 4- Lock and Key
Valuables are what are meant to be kept under lock and key, right? Danny figured that a diary ["A journal!" he would insist on calling it,] that held all his accounts of his fantasies of Vlad in it could be categorized under 'valuable', and therefore needed to be kept tightly locked away. Not to mention his Ghost Zone map, Villain accounts and Ghost Gear; but those were irrelevant at the moment. Protecting that Diary ["Journal!"] was the number one priority. So, when Vlad made a surprise visit to his house that Christmas, he made sure to secure his journal of fantasies far, far away from the manipulative halfa.
It probably wouldn't matter anyway, if he kept it under lock and key. Vlad always knew how to see right thought his 'little badger'.
