The primary reason players hunt for these documents is to unlock the trophy/achievement. This achievement requires you to collect every single document in the game (or specifically within the DLC episodes, depending on the platform version).
On the ground at the very end of the road before entering the factory. wwz key to the city documents exclusive
Recipient: The Tenth Man. Details: The most disturbing document is a single photograph. A hand, decaying but wearing a UN peacekeeper glove, holding a key up to a security camera. The file name is "Tenth_Key_Final.jpg" . The backstory: After the fall of Jerusalem, the Israeli government activated the "Ktav" protocol. Ten keys were forged. Nine were given to the commanders of the retreating columns. The tenth key was placed in the hand of a soldier who stayed behind to trigger the seismic charges that collapsed the Temple Mount tunnels. The exclusive audio log (translated from Hebrew) contains the last transmission: "I am the key. I am the lock. Tell them the city is closed." That key was never recovered. Satellite imagery suggests it is buried under 40 meters of rubble and quicklime, directly on the fault line. Some say that is the only key that actually worked. The primary reason players hunt for these documents