I won’t buy Dell gear again, at home or at work. I bought my kid a monitor for his gaming PC from Amazon. It was advertised as brand new. Dell shipped it in a brand new, undamaged, unopened box. Its HDMI port failed a couple of months later but with many months of warranty left. Then Dell denied a warranty claim because their inventory system had it listed as having been previously registered to someone else. I tried…
You'd have no way of knowing. People used to (maybe still do?) buy expensive graphic cards, take them out and put back a cheap one with a flashed ROM. Then shrink-wrap the box again and return it.
You wouldn't blame the manufacturer in that case. I never buy expensive things from Amazon because you can never trust what you're going to get, especially with inventory comingling.
If you bought directly from the Dell website, I'd share more of your anger. I also dislike Dell in general though, so I wouldn't buy their stuff anyway.