The answer from Xiolink (ex RackMy) who manages Blueboxinternet's servers:
You will need to contact BlueBox Internet directly as you are their
customer. I can tell you all of their servers are not down.
"First, thank you very much for your response.
Unfortunately the domain blueboxinternet.com is now down for 12 hours and I have no way to contact them.
I suspect some bankruptcy and plan to move elsewhere asap."
They answered: "I assure you they are not going bankrupt."