Nope, not a reference! Just being silly and pretending that the sticker is accurate because at some point before the box was packed, it did not contain Tetris (or any other games), and then once it got packed, only then did it contain Tetris. Technically speaking, the contents of almost any box can be accurately labeled "now contains X!" because few boxes are constructed with their contents in them; stuff gets added to them after, which means at some point they did not contain whatever they're holding.
