I've gotten fakes from Amazon, but it is not always obvious that you've got a fake.
There was an article recently with pictures of the real and fake items, both from Amazon. You wouldn't know which was which even if they were side by side.
But the fake will probably fall apart faster, may leak poison and is overall not what you thought to buy.
And that is all aside from the issue of fake reviews, which are so prevalent as to be the nrm. So the product might be an original, but it is not what you thought you were getting in way of reliability or noise et al.
A fake watch (Armstrong IIRC. Wasn't waterproof as it should have been, and - too late - realized the word "water resistant" was misspelled.)
A fake wire sodder, which was pretty expensive and cost me in damage to the item I wanted to build. I turned to the manufacturer and complained, and they asked me to send images... it was a fake.
We got Desitin with a very weird consistency and smell. I am convinced it is not real, and have been afraid to use it.
An external disk drive, wich wasn't fake, but was also clearly not the brand it said on the box. I complained about that, and am still waiting for a resolution.
Those are what I recall offhand, but mostly have been avoiding Amazon.
We don't buy anything from Amazon which will go in or on our bodies anymore due to the prevalence of fake items. As one of the other commenters said - we'd rather go to Target or Costco to pick up brand name items.
The fake SD card problem is so bad that Amazon got an exclusive product (Samsung EVO Select) that only they can sell. Rather than solve the counterfeiting problem, they just make money off it.
This is also the strategy behind AmazonBasics. It's the only brand that is exclusively sold by Amazon. Amazon is basically destroy the reputation of other brands by letting sketchy and fraudulent sellers on their platform do as they please. There are a lot of people who exclusively buy on Amazon so over time they will only trust AmazonBasics products.
There was an article recently with pictures of the real and fake items, both from Amazon. You wouldn't know which was which even if they were side by side.
But the fake will probably fall apart faster, may leak poison and is overall not what you thought to buy.
And that is all aside from the issue of fake reviews, which are so prevalent as to be the nrm. So the product might be an original, but it is not what you thought you were getting in way of reliability or noise et al.