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There is obvious physical damage but you can only see it if you can expose the back of the display, which is usually hidden under mainboard and backplate. (If you google broken eink substrate, you might find some pictures where it's shown both front and back. the back is like a mirror and obviously broken glassware).
The display is the most expensive part of the reader, and at the same time also the most fragile, and hardest to reach. You can order replacement screen from china but it's still not cheap, it has to arrive at your place unbroken, it has to be the right part for the device (can't use any other screen), and you have to manage to perform the replacement without causing damage...
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