Police said Wednesday they were looking for a man who struck and critically injured a 76-year-old woman while driving a box truck in Brooklyn last week. According to NYPD officials, the woman was walking across the intersection of Ocean Avenue and Avenue U in Sheepshead Bay around 9:30 a.m. on Sept. 9 when the driver hit her. Police said the man was driving a white box truck and wearing an orange reflective construction shirt.