Had an experience with what I had a strong feeling was a resealed game. Bought a Super Mario Bros 3 on ebay and was described as factory sealed. When I took a good look at it, I saw at the top right corner back there is a small tear on the box, but the it was perfectly sealed top to bottom even showing the H-seam. Also, noticed that the contents seemed really loose that something inside the box was shaking and to me, it was missing something. So because of those things, I returned it to get my money back. A few days later, I was checking out the seller's feedback and saw a negative from a buyer saying that the game he bought was resealed... He then was selling the same Super Mario 3 but under a different ebay user ID, this time the feedback is in private. I would not trust buying anything from that seller.
Now my question is, how can a re-seal like that be practically perfect? I couldn't believe it was possible! Was thinking as long as it has the H or V seam, then you're good...