The box is filled with coffee compost. The instructions tell you to slit the plastic surrounding the compost and then mist the compost twice a day until mushrooms appear.
here. This isn't a sponsored post, we just had so much fun ordering it and growing them we wanted to share with others. And for such an odd start the mushrooms ending up being good and edible. We were a little worried about eating strange mushrooms, but no hallucinations came.