The last step of the whole process is very simple - it does not require any of the previous steps to be completed. You simply move the picture on the front page, revealing a "secret cubby" with the loot (hana, etc) and thing.pdf (which was used in heist 4).
The problem is that now the front page is gone, due to the bundle release, so it appears as though you've missed your window of opportunity.
If you have read the whole thread, you would have found this post which told you what to do.
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