Look out for indications of mold. If the thing is any inexperienced mould, white fuzzy mould, or darkish black spots (mildew) to the mushroom, will not eat it. Don’t fear if the thing is blue staining—this is typical in Psilocybe mushrooms and an indicator that the mushrooms consist of psilocybin.  https://psychedelicfarmmeds.com/product/nightcap-mushroom-chocolate-bar/