In Harper Lee's To Kill a Mockingbird, at the start of Chapter Seven, Jem and Scout find other "gifts" left in the tree.
First, there is a ball of grey twine. Scout tells Jem not to take it, thinking it is someone's hiding place, but Jem doesn't think so. Next they find two images or "statues" carved out of soap. One was a boy, and the other a girl: they could tell because "she" was wearing a "carved" dress. Jem praises the workmanship, saying he's never seen carving so good. Soon they realize that the figurines represent them: Jem and Scout. Next an entire pack of chewing gum has been left in the knothole, and the following week, there is a medal like that given to winners of a contest, maybe a spelling bee. The next "treasure" they find is a watch. It doesn't work, but it has a chain with a pocketknife attached to it. The kids consider this their best prize yet.
This chapter becomes a silent battle between Jem and Scout, and Nathan Radley. Somehow he discovers that someone has been leaving things in the hole in the tree. When the kids return from school one day, prepared with a note to put in the hole, they find it is cemented up. Mr. Radley says it's because the tree is dying; Atticus tells them that the tree seems fine to him, but diplomatically explains that Mr. Radley knows better about his trees than Atticus does.
The gifts found by Jem and Scout in the knothole of the tree and, presumably, left by Boo Radley began with two pieces of Wrigley's Double-Mint gum. They next found a package pieced together with bits of tin foil. It included a wedding ring box lined in purple velvet with two Indian-Head pennies from 1900 and 1906. They then found two dolls carved in soap that slightly resembled Jem and Scout. Later they found a whole pack of gum, "which we enjoyed"; a tarnished medal that apparently was from a local spelling bee; and, finally, came the best gifts of all: A pocket watch on a chain with an aluminum watch attached.
2 small images carved of themselves, a tarnished spelling bee medal, a pocket watch that would run on a chain with an aluminum knife, 2 indian head pennies, ball of twine