What significant elements are suggested concerning Boo Radely's character by the outcome of Jem's venture?in To Kill a Mockingbird

I assume you are referring to the night when Jem lost his
pants on the Radley fence (in Chapter 6). The children decide to make a raid at night on
the Radley house in the hope of catching a glimpse of Boo. They never directly see Boo,
but they do sight a threatening shadow which frightens them from the property. In the
process, Jem loses his pants on the barbed wire fence, and returns home in his
underwear. The children discover several new things about the supposedly monstrous Boo.
Unlike most of the stories they have heard, he (the shadow) does not attempt to harm
them. Boo does not attempt to follow or chase them through the collard patch. And when
Jem goes back for his pants, he had two more surprises awaiting him: The pants had been
folded on the fence; and 

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"They'd been sewed up... It's almost
like--"
"--somebody knew you were comin' back for
'em."

At that moment they
passed the tree with the secret knothole, and there lay a ball of twine. Although they
didn't discuss it then, they must have known that Boo had mended the pants and that he
had left them the gift in the tree. They were slowly coming to realize that Boo wasn't a
bad guy after all. He was shy and he was kind, and he was showing them that he wanted to
be their friend.