You are right in saying that have not been ignored, but not all reports will eventually be marked as good or bad. Some are left unhandled indefinitely. For example, if a mod agrees with whatever you wrote in the report, but think it isn't severe enough to be marked as "good" and delete the post in question, it may just be left unhandled forever. As stated at the top of the report page, you can think of unhandled as a "soft bad", as your report was correct, just not strong enough to warrant deletion.