Ok, your mount definitely looks a bit different. Who exactly did you buy from?
When you compare with photos of authentic mounts, the surface on yours is duller. Also it's missing the brass washers between the hinges. Compare with here:
https://ultimatenightvision.com/wilcox-ir-patrol-skeetir-utm-flip-to-side-weapon-mount-black/
The fact that yours doesn't latch closed is because you bought the magnifier version that doesn't come with a latch. Only the versions of the SkeetIR thermal mount (that flip to the right side when mounted in front of your optic) come with the additional latch mechanism.