Destruction!!! 😈

One of my girls started to shred my roommates carton box of a board game.

They have plenty of cork in their play area, but I think it got too boring to only shred cork 😅😂 My question is: is it safe for her to shred the carton ? She throws all of the shredded paper away, she doesn’t eat it. And her cere is light blue so I don’t think it is nesting behaviour.