I don't buy drives on Amazon for my 9 year old's laptop because of the rampant fraud and counterfeiting, I'm shocked that they're trusted for any business use-cases by anyone moderately savvy. I'm even more shocked that the takeaway is to blame the individual seller, rather than the marketplace that makes it possible.
Both sellers issued refunds without trouble because I bought them under Prime. One seller seemed genuinely surprised they had a counterfeit in stock.
Both of these counterfeit drives look very, very convincingly authentic, except the serial numbers don't match real ones and don't validate as real ones with the OEM.
The first time, I actually argued with Seagate over it being real, until they pointed out that aside from the serial number not being in their databases, it's not even in the correct format for any of their drives.
If you care about your drives and you're buying on Amazon, only buy under Prime. And when they're delivered, check the serial numbers with the OEM first thing (usually via warranty validation). Don't buy anything not on Prime.