Spoiler alert on Tj's route, I want to share what I discovered, basically an assumption.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
I thinks tj is the one who made the scavenger hunt number 7. I mean it's pretty obvious, he's the one who finds the birdhouse in the forest, he exactly knew where the box is. Other than that, he's eager to end the scavenger/treasure hunt, he surely want to reveal chase's secret. The drawing say it all, after the hiking trip of Chase and Tj at the diner he draw a stick figures that tells story, to connect it the note inside the lunchbox is a drawing that also tells a story. So that means, Tj made the treasure hunt. The thing is, he sided with chase when attacking carl. I think, it is just an escape for himself to not reveal his secret too.