If Maura is out there, somewhere, living a new life, I certainly don't want to blow her cover. It's her right as an adult to disappear.
If she can contact me and can offer some proof of her identity, I'll happily stop searching. I'm sure others would like to know she's alive so that they can stop searching, too. That doesn't mean she has to reveal her location.
But right now, the possibility still exists that she was murdered, or that she was the victim of an accident of some kind that led to her death. This is still very much a confounding mystery. So I'll keep digging until we know otherwise.
Mysteries frustrate me.