They’re not just analyzing the voting results. They’re checking the composition of the paper the ballots were printed on and comparing it to the paper approved by the elections board for the ballots. They’re also looking to see if the mail-in ballots showed proof they’d actually been folded as you’d expect to see in an authentic mail-in ballot. There’s also supposedly a watermark on the ballots that is hard to replicate so any ballots without it would clearly be fraudulent and have to be discounted. As you can see, there are lots of things being examined besides the votes.
The ‘watermark’ is a fable. That claim was made early on during the ‘we caught them’ stage prior to any real investigations. It was claimed that all the ‘authentic’ ballots had a watermark and that it will be easy to determine the ‘fake’ ballots. Turns out, no such watermark exists. I’ll just have to take your word for the other assertions.
Do you have any sources for your claims, or are you just stating your hopes?