This kind of dried mushroom can be eaten as long as it is dry and not moldy and unaffected. No side effects.
It is recommended to check whether there is mildew before eating, and just wash it.
However, generally dry goods are kept for a long time. Shelf life is the time that merchants think that food will maintain quality and safety at the specified storage temperature. But it is not the actual time for food quality assurance.
General dry goods, if your home is not so humid, store for two years.
How to judge whether there is deterioration without shelf life;
Dried mushrooms, look for insects, stale, moldy and the like. If the judgment is good.
Soak the mushrooms in water again to see if they are rotten and sticky, and if the folds inside the mushroom umbrella are eaten by insects. If it is soft and elastic, the mushroom is better folded and tastes the same as the mushroom.