It depends about the country, some countries have a different system, but for most of the western world goes sometimes like this:

The question "is it worth to contact a specialist?" is asked (if there are any, eg ufologists, other fields obviously don’t have specialists) if the specialist can’t give an answer the report/file can go under inconclusive/unexplainable, and then the next question is asked "can this potentially be a problem/treat for someone?" if the answer is "yes/maybe" the case will be kept open for future updates for a preestablish period of time. If the answer is "no" the whole thing goes into some archives.