> Restrict your search to USB drives that not only "Ship from" Amazon but that are "sold by" Amazon. In doing so, you will be weeding out all of the fraudulent devices that the article describes.

> Comingling means your strategy is not guaranteed to ensure you actually get what was described.

Commingling may be a problem in other contexts. But the article is about super-cheap "1TB" USB drives that don't really have 1TB capacity. If you restrict your search to "sold by Amazon" USB drives, you aren't at risk for buying these drives---because Amazon simply doesn't sell super-cheap 1TB USB drives. That's why commingling isn't a problem in this particular context.