Can you also see more than 5000 of the same user (assuming there is any user which has at this moment more than 5000 unhandled reports -- which is very unlikely, I suppose).
Hope I understood the question...
If a report is not attended by any mod and after the specific time period, 30 days or what ever, receives the "unhandled" status it is no longer displayed in any report queue. Only the user that reported the post can see it in his/her report history or maybe theymos in the db. It magically vanishes from the mod report page.
There are 2 types of unhandled reports.
- "not yet" handled (<30 days old)
- "never going to be" handled (>30 days old)