m9sYK (also known as the decoy duck) is an image on Imgur that depicts a standard decoy mallard. It hints towards its own nature as a red herring, redirecting us back to final.jpg. It was arrived at by deciphering the Caesar Cipher / Shift Cipher in final.jpg , which when deciphered read: https://imgur.com/m9sYK

Its usage of the terms ‘out’ and ‘guess’ was a hint to use the steganographical program OutGuess on final.jpg.