"Unresolved cases" refers to situations or investigations that have not been fully solved or concluded. It means that there are still unanswered questions, missing information, or ongoing inquiries about a particular matter. Full definition
Provided direct assistance to field officers, crime prevention inspectors and investigators in support of specific unresolved cases. (jobhero.com)
Hang uncovered hundreds of unresolved cases of spills and accidents related to drilling in New York state, contrary to the Mineral Resources Divison's claim that the state's record was characterized by «a lack of contamination events» from natural gas development. (dotearth.blogs.nytimes.com)
It also says the Agency is failing to clear the ever increasing «controlled archive» of unresolved cases in the Case Resolution Programme. (blog.politics.ox.ac.uk)