If you're considering buying MAC cosmetics from an auction, then please educate yourself on the collections and products that MAC has put out and will put out.  Some good places to learn their product lines are maccosmetics.com, makeupalley.com and specktra.net.  MAC does not sell their eye shadow palettes with little sponge applicators in them, they do not name their cosmetics with just a number or just a code.  The products have actual names and specific codes.  MAC even has specific ways they apply their shade name stickers on the packages.  One seller has stickers of actual eye shadow names, but applied those stickers incorrectly onto the boxes of fake MAC pigments.  One seller here claims to have found some MAC eye shadow palettes in Europe and is reselling them, but that seller wouldn't say where exactly in Europe they found them (like what counter, MAC store, pro store, etc.).  They also wouldn't say what the name of the 4 pan palette was or the names of the actual eye shadows in it.   All blatant fakes, which I knew, but I was testing him.   Also, the single eye shadows do not have mirrors in the bottom of them with little sponge applicators.  MAC has never done this and has no plans to do so.  One buyer I know is a chemistry student in college.  She took a pigment she bought here to her professor and together, they analyized it and found the product to be nothing more than ground up colored children's sidewalk chalk.  These are just some examples, but the fake MAC on Ebay is rampant and not limited to just the eye shadows and pigments.  It's also the lip prodcuts, foundations, etc.  In all of these, the packaging is all wrong and obviously fake.

Prime example:

Educate yourself before you purchase.  Be weary of a seller who only shows advertises a close up of the product's color and not the whole packaging.  Be weary of a seller who acts stupid or is vague to your line of questions about what they're selling.  Ask them what collection the particular product is from, ask them the specific name and for the code on the label, which is on the bottom of all products, ask them where they obtained the item they're selling, ask them for close up pictures of the items, so you can see the font, the labels and how the product opens and closes.  Basically, if you have to ask them any of these questions, then you've already answered it yourself.  The stuff is fake.

I do not work for MAC, but have been an avid collector for 10 years now, owning thousands of dollars worth of MAC products.  I can spot a fake MAC a mile away.  If buyers on Ebay would stop falling for the fake MAC, then those untrustworthy sellers would finally go away.