>deadline
The photo references 6/11 (really 9/11 since we are in wonderland).
If the cypher contains a secret then I assume it will only be relevant up to that date.
A lot of the questions you asked are probably part of the puzzle.
There might be another part of it as well, this might only be half of the puzzle. The attached string may or may not help.
I will sit down later and see what I can come up with. Any breakthroughs will be posted here.
Good
Luck