First off how does a snake that size escape and get lost lol...kinda hard to niss/.
Actually, where I live someone had a boa constrictor get loose I think in late spring so it was warm out at this point. We have a park with a wall that runs along it and some joggers were going by and it was laying out in the sun basking.
The owner had to claim and now we aren't allowed snakes over 6ft. long here because it was the same deal, people said it could eat your pets(dogs, cats)
Check out this story- this snake's been up there for at least a year and a half after being found wandering. It's a little bigger than a boa, too! They don't want to adopt in to anyone with cats or kids.