> You can avoid 99% of counterfeits by buying only from sellers with good feedback.

I doubt that very much. Many sellers never see their products, their suppliers can scam them whenever they like. That's why Amazon themselves have sold fake CPUs repeatedly over the years: https://www.heise.de/ct/artikel/Amazon-verkauft-manipulierte... (German), https://www.theinquirer.net/inquirer/news/3014009/amazon-is-... ...