In the novel To Kill a Mockingbird, what did Scout and Jem find in the Radley tree?

Jem and Scout find several items at various times in the knothole of the Radley tree throughout the novel. The first item that Scout finds in the knothole is two sticks of Wrigley's Double Mint chewing gum. Jem reprimands Scout for eating the gum because he thinks it might poison her, which it does not. They then find two polished Indian head pennies that Jem considers valuable and able to give people good luck. The children also find a grey ball of twine and two soap figurines that resemble themselves. They are perplexed as to who could have been able to carve these figures and wonder who is responsible for leaving the gifts. Jem and Scout also find an old, tarnished spelling bee medal. The last two items they find in the knothole of the tree are an old, broken pocket watch and an aluminum knife. Jem and Scout decide to write a thank you note to the mysterious person who keeps leaving them gifts, only to find out that Nathan Radley has filled the knothole with cement.