I hated to even ask this question because it should be such a basic procedure. I have the gasket tucked into the groove on the lid nicely. I have the gasket lightly greased with silicone. I used quite a bit of force and it just does not make it to the latching point. when I pulled the cover off, even though the one latch is broke it was sealed very well almost like under a vacuum. Must be designed for the lip of the box to go along side of the gasket in the lid rather than a compressed seal. If I can’t get it to seal I suppose I can find some rubberized foam gasket material. Something that Will allow more compression and still seal. I had the exact same issue with my 2002 gtx di rear e-box.
Thanks again Jim