Warped bed :( seems like a common QC issue

Hi all,
I have bought 2 Babmulab X1 Carbon Combo printers form the EU store (first one on 14.January.2023, second one received today).
Both of them have super flat beds - I don’t see any issues even when I shine light under the ruler (when heated up thay are perfectly fine too !)
Im 3d printing for over 10 years now and I have seen a lot of printers that had much worse heated bed flatness.
Even in my RAPTOR XLS 360 printer which I’ve built a few years ago the bed is not that flat across the whole surface when heated up (Heated bed was made from special and expensive CNC milled Gleich aluminium plates that have superior flatness across the whole surface - the cost of the alu plate was around 200$ and it is 8 mm thick ! )

See photos below:


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