Amazon has no real regulation (nor liability) of their seller's products and said sellers take full advantage of that. I've bought electronic gear that has dangerous power supplies, insane 115VAC LED light bulbs - the metal screw extends up the side of the bulb so it can easily be touched when the bulb is fully screwed into a socket, and other sub-standard parts.
Amazon is a clearing house for both good and bad Chinese (etc.) products, and you can't tell which until you receive it. We test everything we buy on both and find about 10 to 20% reject rate of components and products.
Digi-Key, Mouser, and Element products are trustworthy and I buy freely from them knowing the stuff will be as described and proper for my application. Same can NOT be said about Amazon.
Unfortunately we deal with a lot of obsolete equipment and have to take our chances on surplus parts (Unicorn and Surplus Sales are typically good suppliers) that can't be found from more reputable (typically brick & mortar) sources.
John :-#(#