The cardboard sleeve shirt would have been put on by kenner is my best guess. This likely would have shipped to stores this way and then distributed with the sleeve in a seperate box. The numbers on the front are from three different chains, so the sleeves had to come from kenner as they packed these for multiple stores. The 49-xxxx number is Sears, the 655-xxxx is jc Penny's and the 57-xxxx may be from a store called speigel though the swca says it should be 57-t-xxxx so this may not be where that number was from.
I have caviar dreams and McDonald's pockets