Sorry I forgot about this thread. I didn't find any genuine back cover. Only 3rd party. That link to Amazon isn't Samsung lol.
I'm leery about buying anything that is not off Samsung's website anymore. I bought a "genuine" spare battery for the Galaxy S4 that turned out to be a fake. It looks different initially, so I just assumed it was a change in packaging, then the battery levels became unstable and dying extremely fast after 2 weeks. I looked online and it was similar to other fakes being sold.