Can I bake a christmas cake in a cardboard box? So, usually christmas cake recipes call for  wrapping paper/cardboard around the cake to insulate it a bit. (See this question: Why should I wrap a cake tin in newspaper?)
I find myself lacking in newspaper but with a plethora of shipping boxes due to all the online purchases I've found myself doing recently. I happen to have a box that would be the perfect size (small enough to fit in the oven, but big enough for the cake). And also this seems like a great lazy person solution that appeals to me.
To be clear, I mean to put the Christmas cake mix in the baking tin, and then put that in the box.
Given the box is devoid of plastic (paper tape and cardboard only), and isn't touching the element (obviously), would this be a viable method? Anything I need to keep in mind? My plan is to close the box entirely top and bottom and interleave the flaps so that nothing comes open.
Particular concerns:

The box catching fire
The printing on the box releasing chemicals into my food
The oven convection being impeded

Any reasons why this is a bad idea?
(My cake is currently in the oven, I jumped ahead a bit and then thought maybe I should check anyway. It hasn't caught fire yet).
(Also, I did also see the reduce-by-15C-forgo-the-box-entirely method, but my oven only goes down to 140C, the next step down is 100.)
While there is some possibility it could work, I wouldn't even try it. There are things that can go wrong, and many proven solutions to the problem. Replacing a bad hack (newspaper) with a worse hack (cardboard box) is not something I would be keen to try.
A list of preferred solution includes:

use cake strips
bake the cake in a different pan (bundt or thick-walled ceramic pan)
go for a flatter and wider cake (bake it in a quiche pan or a large tawa)
make it a layered cake and bake the layers separately
reduce the temperature and bake for longer
partially bake in a waterbath, then continue without it

If you are absolutely sure that your cake needs a full enclosure (which is quite strange for me - it is actually one of the reasons why I would avoid the cardboard box) I would prefer putting the cake in a roasting dish (earthenware/ceramic or metal) rather than in a cardboard box.