Nah dry mushys are ok as long as you want the trip (in fact dried ones are illegal - and more potent - as they're classed as "prepared", ie. the intent is there) - sprinkle them on pizza and have a great evening tripping :o)
Yes give it a whirl and then the giant bacteria will probably kill you off as they approach with their giant feelers ... ugh .... don't do things that mess with your brain, believe me I have seen the consequences.
Sorry to sound like a boring old f@rt but I did all that, smoked all that etc 30 years ago. Personally I'd put them in the bin unless you know exactly what they are.
Sorry to be a party pooper or whatever you might call me these days.