It seems to me that if the fraud occurs upstream (ballots from people who shouldn’t be voting), AND if the ballots are comingled after counting, becoming anonymous, that it would be very hard to see much fraud.
The fraud occurs in two places... upstream by counterfeiting ballots, vote harvesting, or fake mail in ballot requests for addresses that are no longer correct...
and secondly, downstream of the counting, when the votes are tabulated. (”Dominion.” And, Stain’s “...what matters is who counts the votes.”)
PA had like 5-10 times as many mail in ballot “requests” as ANY other state. The fraud was baked in.