This is a medium sized Lock and lock, it's hidden in a wooded area. It will require finders to locate 3 other caches, solve a simple field puzzle (basic addition, subtraction, division, and multiplication) to get the coordinates for the final location.
Collect the numbers a,b,c,d,e,f. Write them down, drop any zeros and write that number twice. Add or subtract the following offset to the number you have. 0,2,2,-6,-2,+5,3,-7 this is your North coordinate. Reverse the number you just had and add or subtract -6,0,-2,0,0,3,5,1 this will give you the West coordinate. Good luck.
From Wikipedia :
The Slender Man (also known as Slenderman) is a supernatural creature with nebulously defined characteristics and abilities. Slender Man was first mentioned in Something Awful Forum's "Create Paranormal Images". Slender Man generally appears (in modern times) as a tall man in a black or grey suit, red or black tie, and white shirt, with no eyes, mouth, or clearly defined facial features. It has no hair, and generally has normal-looking bare hands, albeit with fingers longer and bonier than a typical human. Slender Man is typically depicted in imagery and literature as between 6 and 15 feet tall, depending on the situation, and in video as around 6-7 feet tall. Because of its inexact nature, and differences between series, no one has yet determined what it is.