Tiny scuff on brand new iPad pro 12.9

That really is a tiny cosmetic blemish in the anodising. The dust in your picture is nearly of the same scale 🙂

If your iPad is otherwise without fault and in good physical condition - as you observe, without a bend - you might decide it would be better to keep what you have.

If you purchased directly from Apple, you have a 14 day “no questions asked” return option. After that, on the basis of your photo alone, I would speculate that you’d have some difficulty in convincing Apple that your iPad has a defect worthy of a waranty exchange. Consider also that after the 14-day return window, an exchange, if offered, might be from “reconditioned stock” in a plain white box.

Ultimately, it’s your decision.

Honesly, if you don't circle it, I would think you were talking about those tiny specks of dust(?) on the Apple logo. I would stop looking at or thinking about that scuff and stop worrying about it. I like things that are flawless but sometimes there are more important things such as the actual device functionality. If it works flawlessly, I'd keep it.

If it works flawlessly, I'd keep it.

Especially since in less than a week, it will get at least one tiny scuff on it from simple use anyway.