Unhandled reports might be revisited, since if the mod clicks ignore on a report, then that only ignores it for them. So, another moderator might see it in their report queue, and decide to act upon it. Although, once the period for displaying the report in queues is gone, then yeah unhandled reports aren't revisited, unless they're reported again in the future. As far as I know, if that happens, and it is then handled at a later date, it doesn't correct the initial report that was marked as unhandled. Although, I can't say I've ever monitored that, I'm just going on a logical assumption.

I've been meaning to do a detailed write up on my reporting effectively thread on when unhandled reports are actually the logical way of handling a report. Just haven't got around to it yet. It's on my to do list for this year .