Ok, this is clearly fake once you open it up. It says PCE Works on the disc itself and on the back of the manual. The white plastic tray is all wrong. The paper everything is printed on is different and so on. I still think whoever makes these is a bit of a prick for not putting such markings on the outside of the packaging.
A shrinkwrap seal, or specifically a potential re-seal is not definitive proof of a fake game. Without a known original to compare to and without opening the game, the strongest tell that this was fake is that the manual is a little too thick and the cd tray was maybe a little too white.