It's true that cardboard may have viable reasons for being mentioned in this context, but the onus is on the writer to prove that this isn't a sensational piece

It's true that cardboard may have viable reasons for being mentioned in this context, but the onus is on the writer to prove that this isn't a sensational piece. As the article is right now, we can only speculate on good faith that they had good reasoning to use cardboard vs existing methods that others have mentioned.