Answer:
In the knot hole, they find chewing gum, a ball of twine, two Indian head coins, an old watch, an old medal from a spelling contest, and two carved soap figures.
Improved answer:
1st- Scout finds two pieces of Wrigley's Doublemint gum
2nd-Scout & Jem find 2 "Indian Head" pennies in a velvet box for rings
3rd- Scout & Jem find a grey ball of twine (this time they make sure the knot-hole is no one's hiding place before they took the item)
4th-2 soap carved dolls of them
5th-full pack of gum
6th-medal for spelling bee
7th-a watch with an aluminum knife
this is in order