The Sony Princess Box is a box with a medallion given to Princess Kenny by the President of Sony and was seen in the Season Seventeen episode, "A Song of Ass and Fire".
Background
The Sony President learns about the Xbox One versus Sony Playstation 4 console wars through a flier Wizard Cartman made for Black Friday. He travels from Japan to South Park to give a mysterious medallion to Princess Kenny. This medallion has the power to make Kenny into a real princess shown by an anime sequence with a theme song.