When you go to the link in one of the emails / junk mails there is a adress you can type in: hiddencase322.netprivate. You get to a caesar ciper code. which translates to:
"Hey there, stranger... or should I say future admirer?
If you've found this place, it means you're curious.
You like riddles, deduction, and that little spark of excitement
when you know you're seeing something meant for only a select few.
Well, let me tell you... you're in the right place."
The reward is the one pic mentioned in one of the chats! ;)
Good Luck to everyone else who is hunting!