Next time you see this one, try 5% (or slightly stronger) KOH solution on the cap. If it’s A. bisporigera, you should get a strongly yellow reaction. While there are other white “Destroying Angels” in the eastern US, not too many occur in upstate New York. Another one is A. magnivelaris, but this has a large, FELTED annulus and ellipsoid spores. There is a key to North American species of sect. Phalloideae on the Amanita Studies website.