I heard about this poor kid years ago and the case is still unsolved..
The "Boy in the Box" is the name given to an unidentified murder victim, approximately 4 to 6 years old, whose naked, battered body was found in a cardboard box in the Fox Chase section of Philadelphia, Pennsylvania, on February 25, 1957.
The body was found discarded in a cardboard box that once contained a baby's bassinet from J.C. Penney. The body was found wrapped in a blanket, and was discovered by a young man who claimed that he was examining muskrat traps, but was later revealed to be in the habit of spying on the young women who lived at the nearby Catholic home for wayward girls.
The case engendered massive media attention in Philadelphia and the Delaware Valley, with pictures of the boy even being placed in every gas bill in Philadelphia. However, despite the publicity at the time of the body's discovery and sporadic re-interest throughout the years, the case remains unsolved to this day, and the boy's identity is still unknown.
The story has been profiled on the television series America's Most Wanted, and the CBS series Cold Case and NBC's Law & Order: SVU both used fictionalized accounts of the story as the basis of episodes.
http://en.wikipedia.org/wiki/The_Boy_in_the_Box_%28Philadelphia%29
There is loads of other info available on google if you just search for Boy in the Box.