Hi Matowen,
Welcome to the community and thank you for getting in touch.
I am very sorry to hear the cover for your external box is missing. This is something we can help with.
I would need to book a technician visit in order to have a replacement installed and to arrange this, I will just need to pop you over a private message to confirm a few details. This message will be available via the purple envelope on the top right of this page.
Speak soon,
Nat