Fake fake fake!
Rimmed windows = fake 'MAC' eyeshadow.
If they were authentic, they would know and use the shade names. To not, would be like selling a MAC pigment without stating its MAC - it makes no sense (people like to know what they are buying, and a lot of buyers are looking for specific shades or LE items). Most sellers put up the finish as well - and will definitely know it if you ask.
Also beware of lots or singular auctions for 'Prismique' MAC eyeshadow, especially those that say its a lustre and give it a number for a shade - these are very obvious fakes.
The real Prismique was an LE lustre eyeshadow from the 2004 Adorn collection. It is white in colour and has a silvery white shimmer to it. The fake ones will be of an array of colours.
Be very careful about buying from Asia and Australia - these are locations of many or mostly proved counterfeit sellers.