Re: Cage or box?
The best option for having a lid on a bin is to cut the middle out of it. That way there's still plenty of ventilation getting through, but if the hedgehog somehow makes it to the top, they can't go any further because the horizontal inward 'edge' created by the lid isn't something they can climb over.
USDA licensed breeder in Port Orchard, WA.
Volcano View Hedgehogs