And the finale started with Dwight thinking he heard Sherry on the radio, so it’s certainly plausible that she’s in the immediate area, and totally understandable that she wouldn’t have wanted to show herself whenever Virginia and others were still around.
It would be a fitting way to push things forward on the Dwight and Sherry front.
Barring her reappearance – or perhaps a Breaking Bad crossover involving a machine gun in a car trunk – Morgan’s survival is very unlikely.
Morgan and John (and the rest) gave Dwight a new reason to live, even in the face of Sherry’s request for him not to keep looking.