Most cats like boxes, even if it’s a preference as marginal as simply standing in a box-lid for a few minutes, as does my big boy, Renn. More typical is my foster-cat, Hector. He enjoys boxes of all sizes, though when he tires of a particular box, he starts chewing pieces off of it and tossing them aside.
Recently, I dropped a smallish box, with lid-flaps, on the floor for Hector’s pleasure. At some point, it was tipped on its side, and he seemed to delight in using it as a shallow cave. I decided to bring him a larger box, so he could have that enclosed feeling cats seem to enjoy. He has been using it since. The best things in life really are free. (Well, if you are a house-cat, everything in life is free, but you get the idea.)