The "Boy in the Box" or "America's Unknown Child", was a boy whose naked, extensively beaten body was found on the side of Susquehanna Road, in Philadelphia, Pennsylvania, on February 25, 1957.

https://en.wikipedia.org/wiki/Murder_of_Joseph_Augustus_Zarelli#Discovery_of_the_body

https://allthatsinteresting.com/boy-in-the-box

https://www.cbsnews.com/philadelphia/news/joseph-augustus-zarelli-the-boy-in-the-box-identification-police