I don't know how much wooded land is in Duxbury,but I wouldn't put it past ya.
We had on here in Mansfield 7 years ago,it was hit by a car,the Police denies it was a Mt. lion,but they called up a friend of mine who is a well known Townie and a Taxidermist they told him he can have it but cannot say a word as to where it came from
It's a good size cat,I would think it could do some serious damage to a person if it was able to get access.