How has the Boo Radley changed (in Chapter 4) in To Kill a Mockingbird?

Boo Radley, one of the main (though mostly invisible)
characters of To Kill a Mockingbird, has actually not changed since
Dill's arrival to Maycomb. What has changed is the children's perception of him once
they begin finding items in the secret knothole. Prior to his reclusive behavior, Boo
had been a normal teenager. But when he got into some trouble with the law, Boo's father
locked him away in the Radley house. It was then that Boo changed. But, as Jem and Scout
would soon find out, Boo was not the crazed ghoul that neighborhood rumors portrayed.
The owner of the Indian head pennies found in the tree was still a mystery, and Boo
Radley may not have immediately come to mind as a giver of gifts, but the prized coins
did get the kids to thinking about Boo more and more.