Every time I get something that comes in a box, I have to leave it out for about a month for the kits to play in. The big box that their bulk litter came in became the place Nini jumped in to groom herself as soon as she finished eating.
Shenene loved the one in the living room and used to jump in it and bite the edges, and I would make the flaps move as if there was something on them and she'd put her little paws out and bat it. This one last six months, then I had to get rid as it looked awful. Sorry, Nene!