Don´t be mad at me but i didn´t do anything, it just fell apart ... i swear ...
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No joke ... i took a closer look, saw a gap and i got two halfs in my hands.
I will clean it up tomorrow when i got home from work and will detach the sticker. But i doesn´t look like that the sticker is a lower area.
Also i think the owner before me has opened it and broke the connection between the two parts. I think it is normaly fixed with the screw.
(green arrow)
And this thin piece of metal should also be connected to the bottom part. (blue arrow)
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