It was Super Mario Galaxy. I knew immediately it was counterfeit. It didn't come in any case whatsoever, which alone would have been enough reason for me to be pissed off because it was supposed to be "Like New". It was also immediately obvious it was on a DVD-R as opposed to the real discs you'd expect, and the label thing on the disc was obviously printed on an inkjet printer as it was all washed out and it wasn't even the right logo anyway, although it was Mario. If I remember correctly there was also no manual or anything like that.
That was the first and only time I bought a counterfeit game. I think 99% of the time you can tell instantly if something is counterfeit, and you don't have to be an expert to figure it out. I don't know how people like that seller think they are going to get away with it. Ebay has a policy where you don't paid until 14 days later, which is plenty of time for someone to report you. So what is the point?
When I complained to the seller he gave me a refund immediately and told me to just throw the game in the trash, which I did, but I also reported him both to eBay and also to Nintendo.