5) Yari Shogi
- Chess pieces, however irrelevant for Yari Shogi (it uses flat ones), the names are relevant, it does have Knight and a Bishop
- The board is 7x9
- Arguably, the 011010 pattern can be read as 1A, or A1, which in some notation might match key/lock location on the board
Sorry to pick this only from the whole analysis, but i'm 99,99% sure this chess piece is not a Bishop. Played on hundreds of chess-sets in my life, not a single one had a Bishop that resembles to piece that is painted. Also played on many chess-sets that had Queen exactly like that. It's a bit non-standard look of the Queen piece, nevertheless some luxury sets have Queen with the collar like that. Bishop is always rounded in that area.
This is important because if that Queen-Knight (Elisabeth and her lover) allegory is true as some suggest, this board may have nothing to do with the chess board and Yari Shogi, it is just used as a mask for real meaning of what is painted. It further implicates if that is not a chess or Yari Shogi board, it gives fuel to the observations that vines and leaves always start in the cracks, between the fields in the board, and that center of the keyhole is exactly in the crack. If it is not a chess board maybe it should be read completely different. That's why it is important that the piece is not a Bishop. A little blasphemy for the end: let's just assume for a second there is 1% chance that rabbit character is not complete troll (I know, hard to believe, but let's give it 1% chance he knows something). In that case his hint with Michael Jackson's YouTube clip - "It don't matter if you're black or white" maybe means it doesn't matter if the fields on the board are black or white because it is not a chess board.
I want to clear your last point up a little:
I've asked White Rabbit about "Dr. Mabuse" because I found the text "Dr. Mab" in the image (border, in the background of the flames). He answered with the MJ video.
There are different movies with Dr. Mabuse. Some are old, black/white. One is new and colored. So I suppose he wants to tell me the clue is to search in the black/white movies.
I found some relevant clues in the movies. But nothing too special else I would have mentioned them here already: One scene shows to mirror an evidence vertically and horizontally. I guess that's something we all did already...
In my opinion he knows more but can't or doesn't want to give more insight as he already did.