These are better to buy in a brick and mortar store where a human verifies that the product has indeed come from supplier who is verified in some way. Of course this doesn't make brick and mortar products automatically safe, but they are far better than Amazon where quality control is offloaded onto the customers.
On the other hand, my local brick and mortar store (Esselunga) has high quality Kioxia usb devices for a fairly good price. And Kioxia is high-end stuff anyways, so worth spending a few more euros.
I'm not that strict about Amazon, but I decided that I don't trust buying OTC pharmaceuticals from Amazon. Even though I hate dealing with the current vendor, since they're bizarrely incompetent a dozen different ways, I suspect they are at least much better about supply chain integrity.
There need to be more class-action lawsuits against Amazon, and the FTC and CPSC need to surveil Amazon's products and take regular enforcement action.
More discussion: https://news.ycombinator.com/item?id=41111317
https://www.washingtonpost.com/business/2024/08/01/amazon-te...
So I just use a brick&mortar pharmacy nearby, where the pharmacists/techs almost always vary from good to conspicuously excellent.
I think the profession is generally good and conscientious.