It seems like there are people who believe the passage of time will either turn these scams into truth, or make them fade away and be replaced by genuine items.  The reality is sadly nothing like that.  Let's take a look at the prevalence of scam USB external storage in 2022.

If you want to test a device you have bought (it should be empty of files when you test it, because the process involves writing to it), here are some utilities:

H2TestW: https://www.heise.de/download/product/h2testw-50539/download (this is the author's page, in German, but the download button is easy to find and the application has an option to install in English)
RMPrepUSB: https://rmprepusb.com/ (has a 'quick size test' option)
ChipGenius: http://bbs.mydigit.cn/simple/?t25890.html (can identify the actual hardware, sometimes)
Fight Flash Fraud (F3): https://fight-flash-fraud.readthedocs.io/en/stable/index.html