Either as part of the Ranging skill or a new skill have the ability to determine if an item is currently "hot" or not. IE, if a theft scent is currently active for the item. This would assist in returning stolen items and in avoiding purchasing stolen items that may later be tracked by rabid rangers that wipe out your village and stamp swastikas on the fields.
Could possibly be implemented in the tooltip, the item smokes green, or as a color shading of the item (similar to how decayed items appear red.)