They want "confidential" visible when the controller is face up. There is probably another sticker on the back.
There's all sorts of little things like this that make me think "fake" why are there two different colors in a pre release version? No identifying marks that make it clear which developer it is?
Nintendo has been doing this a long time and has always new super secretive, I would suspect them to have all manner of protection in place to prevent leaks.