Joseph Augustus Zarelli, previously known as the "Boy in the Box", "Boy in a Box" or "America's Unknown Child", was an American 4-year-old male whose nude, malnourished, beaten body was found on the side of Susquehanna Road, in Philadelphia, Pennsylvania, on February 25, 1957. Joseph appeared to have been cleaned and freshly groomed, with a recent haircut and trimmed fingernails, although he had suffered extensive physical attacks prior to his death, with multiple bruises on his body. He was also severely malnourished. His body was covered with scars, some of which were surgical. Authorities believe that the cause of death was homicide by blunt force trauma.

Fox Chase is a neighborhood in the lower Northeast section of Philadelphia, Pennsylvania, United States.