The best way to tell is by the smell. when they die they smell like rotten eggs. I also read that they can go into hibernation, whats the temp in your tank at? its said that they'll die at above 80 degree's.
He is alive! :) I just had to be patient. The hibernation thing is good to know.
So did you find out if it was alive or dead?
whew, that's great to hear! though one word of advice, make sure every hole is covered on your tank. a friend of mine got an apple snail and when they lay eggs they do it out of water so it goes up into the canopy. a female can carry a males milt or sperm whatever it is snails have for either three months or up to three years so yeah, be cautious :)