If you know Bitmain you would realize this is nothing new. If I recall they have been doing this since the Antminer S5 days.
It's actually a good thing that if you order a miner from them and it comes with dust, it means it was tested at least.
Because they sometimes assemble their miners, don't test and ship them half way across the world and when they are plugged in they are dead on arrive. Then they require a trip back half way across the world.
And I'm sure it was tested for many months to years before they deliver to you trolls hehe, bitmain earned as much money as nvidia last year with shady/evil business practices and you trolls helped it to achieve it, is hilarious hehe