One of the first things after closing I always strongly suggest to my clients is to change the locks at their new home.
It doesn't matter who sold you the home. You just never know who might have been given a key over the years. A contractor who then gave it to some employees? A crazy cousin? You just never know.
Your best bet is to find a locksmith who is a member of the Massachusetts Locksmiths Association.
I'm told that it is not that hard to do it yourself, but I'm not very handy, so I'll be calling the locksmith.
I'd love to hear about any safety tips other REALTORS provide their customers.