Reply to post:

I had something similar happen through Newegg Marketplace, bought a pair of 64GB microSDXC cards and got fakes. My first clue was that they were marked SDHC...

Ran tests (h2testw and FakeFlashTest) and of course they failed. Looked up the part number on the back and discovered that the part in question is used for fake SD cards a LOT. (http://www.happybison.com/reviews/how-to-check-and-spot-fake-micro-sd-card-8/)

After some back-and-forthing (for some reason their e-mail stripped out ALL LINKS as well as inline non-text content making it nearly impossible to send evidence; they ignored it when I said "look up my tumbler post...") I included a text copy-and-paste of the test results. They refunded my money. I wrote a review that explained everything, carefully written in a neutral tone but laid it all out. (Included the fact that they didn't refund the sales tax, though Newegg refunded that later... it was under $2, I wasn't planning to pursue it.) When I checked the review a couple days later to see if the vendor had posted a reply, I found... nothing. It had quietly disappeared. Since I had meticulously kept a neutral tone, avoided accusations and abuse but merely laid out the sequence of events and the evidence I'd collected, I can only assume it had been swept under the rug.

I haven't bought a single item from Newegg since then. If their policy is to silence negative reviews, then I can't trust them.

I've avoided cheap SD cards since then; found an honest vendor on eBay who sells genuine SanDisk media, and have been buying from him ever since. (dz-tech, in case anybody wants to know. No relationship except as a satisfied customer. US-based.)