the snake is probably old enough to be a survivor in the wild, it doesn't really matter when you release it.
As for the likelihood of finding another snake in the shed, it's pretty common in areas with lots of snakes like florida, sometimes it just depends on how secure the structure is.
When I lived in the south, sometimes I would go an entire year without seeing any snakes near my house(though plenty on nearby hiking trails), and other years I'd be fishing snakes out of the pool every few days. It just seems pretty random to me, likely but not predictable to find another snake
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