1. Fake box have rougher texture, real box have smoother texture. 2. The inside of box, fake have a foam to hold it in place while original have their perfume sits with the wrapping loosely. 3. The bottle, the fake ones have a tape holding it in place. I'm guessing because their cap design is low quality and it might spill cause it can close properly.
4. The internal spray mechanism is different. The original looks more cohesive while the fake one have a bulky mechanism and an invisible tube, not cohesive