Where did the blanket come from What do you suppose would have happened if scout had noticed who put around herb?

The blanket was found draped around Scout's shoulders while she was watching the fire at Miss Maudie's house. If she had noticed who put the blanket around her, it would have potentially revealed the presence of Boo Radley as the one who was anonymously looking out for Scout and Jem. This could have led to a significant shift in the children's perception of Boo and their understanding of him as a caring and protective figure.