There are more things in heaven, earth, and voting practices, Horatio, than are dreamt of in your philosophy.

These post-election investigations don't seem to be getting a lot of coverage.  From A River of Doubt Runs Through Mail Voting in Montana by John R. Lott Jr..  

A mountainous, 2,600-square-mile region with a population of approximately 119,600 does not seem like your prototypical setting for machine politics. Yet a recent audit of mail-in ballots cast there found irregularities characteristic of larger urban centers — on a level that could have easily swung local elections in 2020, and statewide elections in cycles past.

[snip]

The story at hand begins during the pandemic summer of 2020, when the then-governor, Democrat Steve Bullock, issued a directive permitting counties to conduct the general election fully by mail.  In the run-up to the election, a court also struck down Montana’s law aimed at preventing ballot harvesting.

Missoula, Montana’s second most populous county and one of its most heavily Democratic, opted in to the universal vote-by-mail regime.

In response, in October 2020, several county residents with experience targeting election integrity issues formed a group to ensure the legitimacy of the 2020 vote. The members contended that Missoula County had shown anomalies in elections past. 

[snip]

Seaman’s office complied with Tschida’s request for access to all of the county’s ballot envelopes, and on Jan. 4 a team of volunteers, overseen by Rhoades, conducted an audit with the assistance of the Missoula County Elections Office. The audit consisted of both a count and review of all ballot envelopes and comparing that to the number of officially recorded votes during the Nov. 3, 2020, general election.

Its conclusions were troubling: 4,592 out of the 72,491 mail-in ballots lacked envelopes— 6.33% of all votes. Without an officially printed envelope with registration information, a voter's signature, and a postmark indicating whether it was cast on time, election officials cannot verify that a ballot is legitimate. It is against the law to count such votes.

What’s more, according to auditors, county employees claimed that during the post-election audit, some of the envelopes may have been double-counted, possibly indicating an even higher number of missing envelopes. 

Auditors also tested a smaller, random sub-sample of 15,455 mail-in envelopes for other defects. Of these, 55 lacked postmark dates, and 53 never had their signatures checked — for a total of 0.7% of all ballots in the sample. No envelope had more than one irregularity.

Extrapolating from the sub-sample, that would make more than 5,000 of Missoula County’s votes — roughly 7% — with unexplained irregularities.

Still another issue arose during the audit that aroused auditors’ suspicions: Dozens of ballot envelopes bore strikingly similar, distinctive handwriting styles in the signatures, suggesting that one or several persons may have filled out and submitted multiple ballots, an act of fraud.

One auditor asserted that of 28 envelopes reviewed from the same address, a nursing home, all 28 signatures looked “exactly the same” stylistically.

Another auditor reported that among the envelopes she reviewed, two very unique signatures appeared dozens of times, describing one such signature as starting out flat, moving to a peak, and tapering out, and another as consisting of numerous circles — a “bubble signature.” 

The whole thing is worth a read.  The issue is real, the effect size debated.  But to rebuild trust between the Mandarin Class and citizens, we need to better address what seems like a scheme to serve the entrenched interests over the representation of actual citizens.