Based on what you are saying this is a user issue.

Are you printing a banner or separator page? Are any of those reports one page or less so that a person separating them could put 2-3 reports in one pile thinking it is just one report? Most reports are only looked at when there is a problem, or maybe at month end. Hoever users WILL complain if they don't get the report.

Here's why - if the queue is not stalled, and the job is in the log, it printed. Period.
You have a user perception or behavior problem not a printer queue problem. Where the physical report went is not your problem syadmin-wise.