Matt is correct, they are common in southcentral Ontario but many people don't see them due to their mostly nocturnal nature. They are even found still in some parks in Toronto. Please release it as close as possible to the area it came from, preferably within 50 metres. They have small home ranges and may not find their way back to their hibernacula if they are released farther away. I doubt your neighbour will ever see it again.
Of course, it would be illegal to keep it, as they are a protected species.