Is my MAC lipstick fake?

[Catslovepies]

Please can I have your opinion on whether my MAC Syrup Lustreglass is fake please? I bought it from Vinted from a well-reviewed seller. This seller was also selling clothes and a Christophe Robin salt scrub but no other cosmetics. I figured this was all a good sign- the scrub and lipstick are probably from an advent calendar and she hasn't bulk bought a load of fake MAC products from China to resell (I'm wary of buying cosmetics on Vinted but this seemed reasonably legit).

The lipstick arrived in an authentic looking box and it looks, feels and smells right. However when I put it next to my other MAC lipsticks the case is much shinier. What do you think please, is the Lustreglass case meant to be shinier?

Some of my Mac lipsticks have shiny cases, some are matt black. All bought from reputable shops. I think it depends on the formula. Enjoy your new lippy!

Here are some photos (hopefully they will attach). The Lustreglass is the shiny tube in the middle.

Cross posted- that's great thank you so much, @Twoscotcheggsandajarofmarmite!

I got this last week in the JL advent calendar and it was the first MAC lippy I've had in a shiny case so wouldn't imagine it's fake because of that.