Here are some images to illustrate the crack and chip on the top righthand corner of the wall box.
There’s a small hairline crack about 1 inch and on the corner a chip out of the casting. The chip is right on the corner so isn’t really visible when the wall box is shut.
The hairline crack runs towards the corner and there the chip measuring about 1.5cm. Hopefully these clear up the situation for you.
I’ve done a video on YouTube to illustrate this more and gives a bit more detail about the functionality and shots of the inside.