Riddle: If someone were to write a biography about us, the following could be reported: #1- Some of us reside in boxes, and others of us can be found resting in the backs of cars, but we are not homeless. #2- Four of us are found in a part of every ship. #3- One of us is famous for falling down a steep incline and injuring himself. #4- Ten of us are associated with a round ball, but we are not basketball players. #5- Unfortunately, one of us is reputed to be a serial killer. Based on the biographical information above - - - Who/what are we?