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It's not unknown to this forum. If it's a boxed version, you should return it as soon as possible and get a copy with a serial key on it. If it's digital distribution system, mail their support service. If it's Steam or Impulse, I believe you don't need serial key to install and play.
It is a boxed version, but I bought it while I was in Manhattan and unfortunately I live 90 miles away. I would have to drive 4 hours round trip to return this product.