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Hint 1
She says she wants you to email her, but you don't seem to have her contact information.
Hint 2
Thankfully, she keeps quite a bit of her information public.
Hint 3
Her e-mail should be in the "About" section.
Hint 4
But you'll still need the codeword...
Hint 5
She mentioned she was an animal lover, didn't she?
Solution
Final Solution: Her e-mail shapira.agatha@gmail.com is in the "ABOUT" section of her Facebook -- the keyword you need can be found by giving all the animal photos their alphanumeric letter based on the stamps you had on your postcards.
Hint 1
One of the bits on the back of card 1 translates to "Favorite quotes."
Hint 2
Have you found her favorite quotes in her Facebook info? They don't look like quotes to me...
Hint 3
They look like dates, only... with one extra set of numbers...
Hint 4
Hmmm... Day, month, year... word?
Solution
Final Solution: Using the modified Arnold cipher in her quotes to index, you can draw a single word out of each referenced quote. The result is: "The fourth key is Mercury."
Hint 1
One of the items you deciphered on the back of card 1 said 'header', right?
Hint 2
Have you looked at the header image? I mean, really looked at it?
Hint 3
You can't see the whole thing unless you click it.
Solution
Final Solution: Clicking the header will reveal a QRC hidden behind the profile picture. Scanning that will give the text: "Key 2 is Azure."
Hint 1
One of the bits you decoded on the back of card 1 said 'locations.'
Hint 2
Where on Agatha's Facebook page are many locations referenced?
Hint 3
Looks like she's shared a lot of profile pics from different locations.
Solution
Final Solution: Checking the location tag for each profile pic, in order, will give you a message using the first letter of each. The plaintext is: "Key Three is Beatle."
Hint 1
You may need to scroll down for a bit.
Hint 2
Her Facebook is honestly not very original.
Hint 3
It's mostly quotes by different writers!
Hint 4
The original authors last names will help you out.
Solution
Final Solution: Finding all your authors last names and going from most recent will give you "KEY ONE IS MANGO"
Hint 1
Agatha linked you to the hints page, but where's the backdoor she mentioned?
Hint 2
It looks just like the FBI tipline you used before, right? Unless there's something you can't quite see.
Hint 3
It says to click 'Continue,' but it doesn't say which one.
Solution
​Final Solution: Instead of clicking the button, click the actual in-line word "continue" to be taken to the backdoor code that Agatha set up.
Now you need to find your embedded keywords to proceed to the next page.
If you've solved all the puzzles listed above this one, you should have them (feel free to use the Internet "Find" feature so you don't have to scroll through all that code). .
Hint 1
By this point you'll have used almost everything...
Hint 2
Except for one item. If you haven't solved your cards fully, stop here until you do so.
Hint 3
Anything you haven't used yet from card 5? Maybe something that could relate to the Ouroboros?
Solution
Final Solution: The password to the final video, decoded from card 5, is: "Anaconda."