Hi!
I think that you can put a litter box in when he arrives, that way he’ll probably at least get some in it (less work for you! 😉 ), and it will give you a good idea of where his preferred spot is. 🙂
I haven’t heard of that technique before ~ it sounds interesting! 🙂 I don’t think that it will make much of a difference if the newspaper is old or fresh, for just a few months ago, I temporarily traded out my buns’ bedding for paper, and I could definitely still tell it was there. 😆 But yes, I agree with scooping up the accidents and putting them in the box. Another technique, is also putting hay in the litter box as well. This way, they have something to entertain themselves with. 😉
About covering the floor with newspaper ~ I’m not sure. You could try it and see how it works, I just don’t know if they’d end up making a mess from it. 😕
Sorry I couldn’t be more helpful!
Wishing you a litter-trained bun!