[Nabeshin]

For every piece of hardware? I didn't think Amazon checked that throughly for devices that aren't theirs
Plus, if they were so meticulous, the wrong item or EB methods would never work, right?

You're missing the point.

I'm simply stating how goods are Invoiced, and not the action(s) taken under suspicious/fraudulent circumstances that warrant a thorough Investigation by their fraud department - which can take up to 45 days to complete. The duration demonstrates just how In depth their Investigation Is.

What about returning the "blacklisted" device inside the good one's box, so that the external serial matches? Do you think they'd check the device as well?

There's every chance they will - say goodbye to your SE.

The SN is kinda hidden in the Quest 2, you have to remove a piece of the strap to see it

And?

It takes 4 seconds to push up on the strap and reveal the serial number. A 4-year old can do It.

So you think they do such a throughout check on every return, even if it's the same item as the one I ordered? They really care that much? And would they act on it since there's nothing actually suspicious? I could've simply misplaced a device, no?
Just curious, of course.. how else would you "launder" the device otherwise?