Who do they think put it on the children's shoulder ? What did Atticus say scout may do someday?

Atticus knows Boo Radley put the blanket on Scout's shoulders, "Scout can thank him for covering her up.''Thank who?" I ask, "Boo Radley. You were so busy looking at the fire you didn’t know it when he put the blanket around you." (72). Atticus thinks that Scout may actually meet Boo someday.