How to steal a close election.

[nitpicker]

1. That is why we have the pollworker team certify the counts & send sealed ballots to election central

And have timestamps on when the polls opened and closed. (in VA) And sign and seal up the other election pollwork and send it to the office.

The ONLY opportunity I can see is if the pollworkers all collude, before the polls close, to check in "ghost" voters and cast the ballots. But Virginia requires at least one person on the team officially represent Republicans and another represent Democrats. And you can make assumptions about how people would vote based on address, but I know a certain person who would get very upset if the Democrats started sending literature (based on a fake/altered vote).