I've had this experience with several big retailers recently. One is B&H, who sold me a "new" Focusrite 18i20 4th Gen last month which had clearly been opened, cosmetically damaged, and returned. I've also had this experience many times with Sweetwater (musical instruments retailer). There used to be a sales rep there who would participate in a particular musician's forum that I was a member of and would get us a slightly better price than is standard if we ordered through him directly. Many people who did so, including me, received what was clearly opened and returned items, sold as new. I assume they do this because the vast majority of people would rather not bother and will just accept a small defect.
I've spent 5 figures with them over the last few years, and they've always been good to me too. I'm writing this off as a one-time mistake, but I really hope it doesn't become a trend.
Could also be caused by a bad employee doing shenanigans or a could also be a one off mistake. But it could be something B&H is doing to unsuspecting customers and that is terrible for their reputation.
They’ve been sorta good, but rumors if things like this have been persistent for a decade. Photographers would get a few copies of a lens, and then return copies ones that were not up spec. B&H would allegedly just relist those as new, not open box. Many manufacturers don’t seal their boxes…
I heard some rumors though I'm not sure how widespread the issue is. So far B&H has had a pretty good reputation, maybe they changed management and whoever is in charge doesn't care about reputation, only profits.