Please use the API call - 'SEQ-case-investigate-results: Get screening results' in order to fetch the results of a case for determining the resolution status.
You can determine the resolution status of the match from the object - resolution, in the response of the API call.
Also, please refer to the below link for more details on the resolution status of resolved, unresolved and auto-resolved matches.
Section : World-Check One API Resolution status of a match
Hope this helps.