I have already considered all of this. Thanks for the warning, but I'm not an internet n00b
I do indeed not trust the second case.
The first case is listed by many different sellers for different prices between €10 and €35, and most copy each others descriptions. There are a few that do mention the sleep/wake function. I have already ordered that first case and received it several days ago.
https://www.mobileread.com/forums/sho...d.php?t=204953