The story was written by RealClearInvestigations, a right-wing pro-Trump site, so I don’t trust the bias of the site to report about the investigation with impartial intelligence. And I do not find the issue compelling enough to make time to do further investigation. My tendency is to think that there may have been some issues of some sort with procedures in that county, possibly having to do with how they stored their materials after the first count, since it sounds like the issue had to due with the number of envelopes found by the audit. That sounds more like mistakes and sloppiness than a conspiracy to me, particularly because it would not be worth the effort to mount a conspiratorial election fraud attempt in that county.