When you thaw out the mice, you do not want to use boiling water.
THAT IS A BAD IDEA.

Warm tap water is plenty fine. I personally run it under hot tap water until it's thawed out completely then blow it with a hair dryer and feed.

You could severely hurt your snake if you gave them mice that were just boiled, because the mouse would be too hot and burn the snake internally. They don't want something cooked.