My NMP had a seal and I'm happy that I have not opened it. After a broken flash or some kind of a defect on the mainboard, it was repaired by qnap without costs. After repair there was a new seal on it, so qnap seems to take this seriously.
I also don't like the fan but at least it is almost not hearable since 1.2.1.
NMP-1000P, TS-569 Pro (3.8.1 Build 20121205, 5xSeagate ST3000DM001, EXT4)