What does Jem think about his pants being left for him at the Radley place?

In Chapter 6, Jem attempts to get a look at Boo by sneaking into the Radley's yard and peeking through their window. Unfortunately, Nathan Radley hears them in his yard, and he comes out with a shotgun. While the children are running out of the yard, Jem gets his pants caught in the Radley fence and is forced to leave them behind. At the beginning of Chapter 7, Jem tells Scout that there is something he didn't tell her about that night. Jem explains to Scout that his pants were "sewed up" and folded neatly across the top of the fence. Jem is confused and mentions that someone had to have known he was coming back to get his pants. Jem is perplexed and cannot quite grasp who was responsible for mending and folding his pants. At this point in the novel, Jem is unaware that Boo Radley is a magnanimous individual who took the time to sew his pants.