As I have some experience in this area, I feel that I should comment. Please don't take this the wrong way, as I do not have any involvment in this practice.
Some years ago, I was introduced by way of a mutual friend to somebody who was selling fragrances. Lots of them. And I could have them cheap, for resale. After enquiring with this gentleman I was told that these fragrances were fakes, but they were identical to the real thing, but at about 4/5 of the cost. I happily bought several as it was close to Christmas, and I thought they would make great presents, although I would tell the recipients that they weren't genuine. I didn't expect these fragrances to be of any substantial quality though.
Anyway, as it turns out, some of the recipients told me that they could not believe they were fake, including my own mother who had a Chanel no.19 'habit'. Of course, I knew this and I had given her the fake no.19. There was absolutely no difference. The scent, the packaging (even the inside) was identical to the one on her dressing table.
With this information over coffee I enquired of my 'contact' exactly how they could be so close. What he told me was interesting. The perfume 'knock-off' business is HUGE. It is directly run by big criminal gangs, just like the drug distribution business. They have extremely talented chemists who work out the scent formulations, and then they have people who used to forge currencies work out the packaging details (which is somewhat easier to forge than money). This attention to detail creates a product which is almost undetectable as a fake except by an expert. As you can imagine this brings in huge sums of money, at a substantially lower risk than currency forgery.
My problem was that I ended up with lots of people asking to buy perfumes from me (and at 50% of the retail price of the genuine item they would have made me a small fortune), but after learning of the criminal reality of the situation, I had to decline.

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