Hello!
Currently access to the watch house is managed through receiving a key from Sgt. Slathers after getting a letter of recommendation from the High Sheriff.
If someone quits, we cannot mechanically enforce them returning the key and in the case of good disguisers we couldn't reasonably keep them out through the exile mechanic either.
Essentially meaning - someone good at disguises can maintain access to the watch house forever.
I want to suggest the following:
Allow the High Sheriff to change the locks through an interaction with Sgt. Slathers for a small fee, rendering all previously issued keys invalid.
New keys will then be issued upon exchanging a new letter of recommendation.