Previously opened packaging is not a barrier for most items, but it is a safety issue for a computer storage device. The micro SD card has been removed and replaced with a lower and slower card than what was supposed to be in the box. Looks like the person checking the return didn't look closely to see it was open. If it had been in the plastic bag it came in it would have been harder to notice it had been opened. So someone just didn't take the time to take a closer look.
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