Any luck?
I suppose it doesn't appear cuz you may have found it before, even if not realising it. Here's all of them in case there is a different one you haven't found!
1. Cabin Roof
2. Signal
3. One of the trees with ropes
4. Day 2, next to the third big rope
5. Inside the fireplace
6. Bean's favorite log
7. Backside of the cabin
8. Among the graffitis
9. Next to the journalist's van
10. Lake's rock-holding structure
11. On the tree in the path to the lake
12. On the lower part of the normal tree that falls on Day 4
13. Behind a tree in the new path of Day 4, behind the fence. A tree that is kind of inside the pathway
14. Behind the tree next to the leaf piles at the cabin
15. Next to the fence/rope you open on Day 2
16. On Day 2, behind a tree between the 2nd and 3rd rope
17. On the fence opened on Day 3
18. Next to the fence opened on Day 4, on of the tree next to the fence, the closest one even
19. Next to Googliel's cross on Day 3, where you felled the tree from Day 1
20. On the same tree as the beard