How to Identify a Fake Samsung Micro SD Memory Card : 8 Steps (with Pictures) - Instructables
Genuine Samsung EVO Plus 256GB MicroSD SDXC C10 4K U3 Memory Card MB-MC256G US | eBay
Warning to anyone buying Samsung SD cards off of eBay. They are made in Korea, so always check the back of the card (real on the left, fake on the right) :
File:Decapsulated microSD memory card lineup-genuine, questionable, and fake-counterfeit.jpg - Wikipedia