hmmm I would need a bigger box for the very angry wife as well if I did that
here's our cat Simba in a cat trap, he weighs well over a stone and sat in the smallest possible box
Some packing tape and a stamp and your problem is solved.
problem i have is that every time the cat gets on it and i see it ... it shoots off as soon as the window or door opens, so can never catch the bloody thing
Apparently they don't like citrus smells so try spraying the roof with something lemon scented.