hey guys,
somewhat recently i picked up a used copy of metroid prime hunters. when i got home and examined the cart, i noticed it had a sticker on the back of it stating:

NOT FOR RESALE - DEMO GPK ONLY
PROPERTY OF NINTENDO

does anyone know what the deal with this is? btw, it didn't dome with an actual lithograph, just a plain white sheet of paper that someone wrote "Metroid Prime Hunters" on...
is this a rarer version of the game?

thanks for all the help!!
-forever_final