In netflix' Marvel's Daredevil season 2, Wilson Fisk is seen eating steak in his cell. Upon drinking coffee, he again feels a bruise on his lip, inflicted by Matt Murdock which he met earlier. He then calls one of his henchmen, telling him to re-evaluate Matt Murdock's file.
Does Fisk figure out that Murdock is Daredevil, and if so, how? Does he conclude this purely based on the punch Matt threw at his lip?