{snip}...As the quality manager, I have final review and approval responsibility for audit reports prior to submittal to management. {snip}
{snip} , and citing the standard for findings to allow understanding by the auditee and management.

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I think you're on the right course, questioning "should this really be a finding?". Well done.
IMO this should be a cause for a pat on the back for the guy who started the chart. No finding, no OFI...he is already moving on an OFI under his own initiative...the opportunity to increase right-pick percentage.
What he is doing IS continuous improvement...bend over backwards to help him. Report this to management as an employee worth paying attention to and rewarding. Life is so full of the other kind.
If you want to capture the work into your QMS, meet with him and fill out the forms with him...{read fill out the forms FOR him} then ask him what could be easier about the QMS and the forms so that he wouldn't mind doing it himself next time.
Those not familiar with a QMS find it a burden even if it makes life easier...make yourself the bridge, and be willing to alter the QMS mechanisms to promote his desire to keep up the good work.
...then go looking for the next guy doing a good job, and introduce the two guys to each other...these are the guys you want guidance from for how to improve your QMS mechanics.

