A NintendoAge member asked:
Q: the ds game in that mystery box auction wouldn't happen to be yugioh world championship 2011 would it? Are the cards still sealed?
A: I can neither confirm nor deny the identity of the DS game in question. However, I will say that the cards, while not sealed, are still in the original (opened) plastic and are in good condition. I don't grade cards, but to me they look spiffy. There are three of them total.