What are some of the objects that boo leaves in the knothole for scout and jem?

In the tree on the Radley yard: 1) Two sticks of gum

2) Two scrubbed and polished Indian Head pennies

3) Soap figures representing Jem and Scout

4) A full pack of gum

5) A tarnished spelling medal

6)A pocket watch that didn't work on a chain w/an aluminum knife