The Locked Box.

I am the type who pays attention to detail and I have by far, created a list of his life summed up to date to further understand someone of his character. He taught me a lot and it is bcoz I chose to learn too...how one could be so difficult to know, however cloaked in mystery he is and always holding something in reserve. A locked box he kept away, far far away with no intention to share with anyone ever got me intrigued till today. No clues, hints or easter eggs was offered for this. It's hanging over me and will probably hang forever. A locked door we were supposed to open together, never did happen. 4 out of 9 checklist was striked off, the other 5 was abandoned in every ways possible. Why? It will be revealed before the ending.