Once a week, any overdue key returns are to be followed up.
You can check this through Key Tracker in Air Table - Overdue Keys.
This will show a list of Overdue Keys.
Your task is to go through this list and check;
Is the key already in the key room? If yes, update the key to returned
Is the key checked out with a trade? If yes, contact the trade to see if they still have it. If they require it longer, update and extended the due date.
Same process to extend the due date if the Property Manager, landlord or tenant etc. has the key and required it longer.