I'm sorry, but it continues to baffle me how someone can mistake an Amanita for a Coprinus (or Agaricus). To my eyes they're as different as a bottle of milk and a bottle of Drano. I suppose I can see how very young specimens of Amanita can resemble other varieties, but then you can follow a simple rule: if it looks remotely like a baby Amanita... don't take it! There are plenty of other mushrooms that are virtually unmistakable.
And then the idea of not double-checking what you foraged before cooking and eating it? That's... unconscionable. I've been foraging for 30+ years, and I still examine each individual specimen before putting it in the pot.
It's a shame because these kinds of stories create unnecessary fear in Americans about picking things from the wild, when there are so many great tastes and experiences right there at your fingertips.