I am so happy for you and the youngster. It teaches him there are nice people in the world.
I had a similar experience when I dropped my wallet in the condo parking lot. The neighbor upstairs grandson found it and they returned it to me. They didn't want the reward offered as she is a religious person and felt that was the right thing to do.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).