Look out for signs of mold. If the thing is any eco-friendly mold, white fuzzy mold, or dim black spots (mildew) to the mushroom, don't try to eat it. Don’t fear if you see blue staining—This is certainly common in Psilocybe mushrooms and an indicator that the mushrooms include psilocybin. https://magicchocolates.co.uk/product/good-trip-psilocybin-mushroom-4g/