Black Racers will bite if cornered but are not poisonous.
If it were me I would leave them be and keep the well cover open just a bit so when they do hatch they are able to get out easy. They won't all hatch at once, and will scatter for food, and won't hang out as a family. You might have a couple that will stick around but you will hardly ever notice them. Obviously your yard or neighbors was the mothers home turf, when was the last time you saw one on your property?
Steve
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