We can't bring ourselves to recycle two shipping boxes that Harris has taken over in our bedroom. He's been having so much fun with them. Since we don't have his favorite pole toys anymore (and no swallowed string has materialized) we play with a fleece ribbon on a pole and a red plush cherry toy that I tied to a length of wide grosgrain ribbon that no one has ever seriously tried to eat.
Harris also likes to play in his boxes by himself. If he keeps tossing them around at 4 in the morning and waking us up, I'll have a serious talk with him. But I still won't get rid of the boxes. I am wrapped around his paw.