I have no idea what a genuine 182 looks like, but if you look at the seller's feedback more closely, there are some red flags:
"not sure of the authenticity, I have a couple from saks and their a little diff." (GIORGIO ARMANI 10Pcs Brush Set,Brand Case)
"dinky ass brushes. not worth $30 bucks but whatever... here's a + anyway" (MAC Blue 3pcs Brush Set~Limit Edition)
"Very good price but not authentic brush..Haven't use yet it but it shred but soft" (MAC #150 LARGE POWDER BRUSH WITH BLACK VELVET CASE)
"thank you Follow-up: Received item but the brush is shedding alot and falling apart!" (GUERLAIN METEORITES Powder Brush)
Other suspect things:
- the guy (comments indicate they're a male) is selling nothing *but* brushes, and I'm guessing he's selling genuine low-end ones like Mary Kay to pad his feedback.
- at least a couple of his auctions feature water-marked images, but they are marked with someone else's username: shadow-20 and that's not listed in his ID history
- he's not addressed the neutrals he's accumulated so far
- someone selling genuine high-end products, especially specialty products like brushes, would be crazy not to have a detailed description. Selling a valuable brush lot with a brief description like the following indicates a poor knowledge of the product except as a lucrative moneyspinner:
"MAC Blue 3pcs Brush Set~Limit Edition - Merchandise Description: 129se+213se+316se
Condition: Brand New Never Used Nor Tested! This is not sample or tester!!
These products are 100% authentic, brushes are not replica. They are all brand new, never tested nor used. Our brushes are not sample nor tester of any sort. Treat your face a little and indulge yourself in these brushes. If you really take care of them, they can be used up to 3-4 years."
- For their $199 NARS brush listing, they offer as a bonus: "2 GIFT - annasu style mirror and comb" I'm not an expert, but the free gifts also look fake!
And finally, if they were genuine MAC/NARS/Shu Uemura etc. brushes, no way could they afford to sell multiple brushes at such a low BIN prices and expect to make a profit! Only if they are cheap fakes can they afford to do this.
In my non-expert opinion, this has fake written all over it because of the other evidence.