The enclosure looks exactly like Samsung D3 Station 4TB, which I opened a pair of just yesterday. There is no sticker per se, but the sides of the enclosure are not only screwed together (two screws at bottom, under the small rubber feet), but also are glued together, inside, at places were the screws are. I'm not sure I could open it without leaving visible scratches.
Besides, why bother? It can be precleared/tested at reasonable speed via USB 3.0 without opening.
Because seagates dont insta-kill. They take 6 months-1 year before mechanical issues start, most dont die of bit rot or bad sectors. Yes this is $130 cheaper than the hgst nas version, but if warranty is void as soon as you open the case...