To Kill A Mockingbird Symbolism Chapter 3 or 4?

One afternoon, (chapter 4) as she runs past the Radley house, she notices something in the knot-hole of one of the oak trees in the front yard. She investigates further and finds two pieces of chewing gum. Scout is careful, but eventually decides to chew them. Upon learning she is chewing found gum, Jem makes her spit it out. Later, toward the end of the school year, Jem and Scout find two polished Indian-head pennies, good luck tokens, inside the same knothole. All these gifts are a symbol of Boo Radley's kindness and fondness for Scout and Jem. The gifts are a symbol of Boo reaching out to them.