Look out for signs of mould. If the thing is any environmentally friendly mildew, white fuzzy mold, or darkish black spots (mildew) to the mushroom, don't eat it. Don’t get worried if the thing is blue staining—this is popular in Psilocybe mushrooms and an indicator that the mushrooms have psilocybin.  https://bookmarkhard.com/story19507300/examine-this-report-on-bluemeani-magic-mushroom-chocolate-bar