Look out for indications of mildew. If the thing is any inexperienced mold, white fuzzy mould, or dark black spots (mildew) over the mushroom, don't try to eat it. Don’t get worried if you see blue staining—That is prevalent in Psilocybe mushrooms and an indicator that the mushrooms contain psilocybin.  https://psychedelicfarmmeds.com/product/lyt-mushroom-chocolate-bar/