Best to my knowledge this website is on box 13
Correct.
You should ignore the Box numbers on 110MB's ErrorDocuments, they're only related to 110MB's current convoluted ErrorDocument system.
Box 13 changed it's IP on 26 February (suggesting the server has been successfully
wrested from the grasp of 'Burst'), but neither FTP or Control Panel have worked since that date.
I cannot explain why your
links don't work, but if your site is MySQL dependent you might find that MySQL is currently inoperative on this server. Personally, I don't use MySQL on Box 13, so I cannot comment further.
You can monitor HTTP/FTP/Panel functionality with these constantly updated monitors..