Zippo Slim Matte Collection

Yikes, how do you tell if you have a Chinese rip-off Zippo? (Serious question). Just because all of my old Zippo lighters from 60s, 70s, 80s, 90s are built like a tank and they aren't even the armor version. But I recently purchased a solid Brass one a few years back and I swear it's the flimsiest little thing ever, but I sent it back to Zippo to get the hinge fixed so I know it's authentic. So now I'm wondering what I need to look for between the newer Zippos that aren't worth a damn (not all, just some) and the Chinese fake ones.

Does this leak if i dont use it for like two weeks