How does Sherlock Holmes end up with a hat belonging to Henry Baker in "The Adventure of the Blue Carbuncle"? O Baker himself brought it to Holmes after he was robbed of his goose on Christmas morning. O Peterson, a commissionaire, brought it to Holmes after he saw Baker being attacked on Christmas morning. Watson discovered the hat on the street on his way over to Holmes's house two mornings after Christmas. Holmes found it on the street under a broken window and next to an uncooked goose on Christmas morning.​