Again, the way they check the machine is pull random ballots from the pile of ballots and run it through the machine. If the machine comes up with the correct number they certify the machine is correct. If a person runs multiple ballots through a machine that has been certified as correct, this still does not address the accusations ballots were run through the machine multiple times as the machine will give a count whether it is fed 100 unique ballots or 10 ballots run through 10 times. Each time the machine will determine it saw 100 ballots and will have reported it has counted 100 ballots.
That is the ideal situation for counted ballots...the question is how the machine tabulated the vote counts on each ballot and that is what folks are saying got messed up. Especially when the machines we find were internet connected to others.( and we now know it did happen) Rounding errors introduced into the software that favor one candidate over others become significant over multiple precincts. Only handcounts in those precincts can catch the software fraud. But that is a massive undertaking and subject to bickering and disputes and court fights. Yes ideally one could take say a hundred ballots and tally them and confirm yes....the machine can confirm there wer 100 ballots...but did they tabulate the votes on the ballots correctly or was the vote off from what was a given known standard. A machine cut off from outside interference and certified thru testing should not have any errors from a known tally of ballots run thru them. But if a network of machines could be interfered with in real time over millions of votes with precious time left for certification...that is something else. Also harder to get permission by the courts to check if no other evidence of overvotes, multiple ballot tabulations, ect which are easier to spot.
Apparently 3 dominion workers are now singling like canaries...I guess we’ll see. Not a lot of push by Pol’s in general to want to stand up to defend Trump...a lot of foot dragging.
Your question about multiple ballot runs. That is what happened in one circumstance in Detroit in 2016. (Steins recount) The manifest on the secure box said 306 ballots but when the seal was broken only 51 ballots were inside and the precinct station had only 51 voters for that election that day. They had run the ballos thru 6 times for a fake vote of 300 votes for Hillary and 6 votes for Trump. They corrected the counts(still couldn’t prove if the ballots were faked but the counts did improve for Trump in the state by 250 votes which were taken away from Hillary while he lost 5.
So you have to look to see if ballots matched the numbers as recorded on the strong box manifests and to see if they matched the numbers as having actually voted in a precinct, who are actually registered as a voter,on that given election day.
Otherwise there is no other way to prove fraud if everything else matches unless you get sworn witnesses that come forward with videos of time stamps and testimony that says no way 95 percent of the registered voters in precinct X voted that day or even absentee and here is precinct leader telling us to cheat and how.