I hadn't either until I got my NIB DOA 2018 MBA.
I wouldn't have even suspected battery damage out of the box so I Googled to see if there was some weird glitch I set off trying to migrate it and to my surprise I found people with my exact same story including one thread that was already on MacRumors:
Then the jaw-dropping incredible pricing made more sense. It was still an incredible deal, but you might have to jump through some hoops to restore it to working order first.
In the case of that MBA, some people did get working units. It might be in that thread I referenced above where someone returned it and got a good one the second time around. By the time I tried that, they didn't have any left.