See, in your initial post you said that this is making the circuit in Florida, but your post here says the only cases you know of are the three snakes you lost. Who else in the Florida circuit is experiencing these same symptoms and losses? Your initial post sounds as if it's a much larger widespread exposure than your own animals.
Freezing actually is the last thing you want to do with a body for a future necropsy - refrigeration and submission to the vet within a day or two is best.