: Located on a box inside the cave before the final radio tower sequence. Significance of These Papers
Unlike the "Eight Pages" in the park, which are primarily a gameplay mechanic to trigger Slender Man's pursuit, these documents function as that unlock achievements and fill out the Scrapbook menu. They reveal that: Slender The Arrival
: Found on a barrel in front of a raised shed near the tunnel entrance. : Located on a box inside the cave
For a complete list of all 13 note locations, you can check the comprehensive Slender: The Arrival Guide on Steam. Slender: The Arrival - The Complete Guide (2016) Slender The Arrival