I do not know how that happened, hopefully one knows. If you are wondering what those white tracks are, it was provisionally Tape.
Buy a new cover.
Or if clips still take off cover and put together again.
Clips? Sorry do not know me
Close the frame unscrew and see if the clips are still ok. Are.
Example like that.
Thanks, I'll try it
Broken can't go much
It is best to search a video for exactly your model.