This tweet from David Shafer, Chairman of the Georgia Republican Party, is a couple of weeks old now, but it's worth revisiting:
"Let me repeat. Fulton County elections officials told the media and our observers that they were shutting down the tabulation center at State Farm Arena at 10:30 p.m. on election night only to continue counting ballots in secret until 1:00 a.m."
I can only think of one reason why you would tell poll watchers you were shutting down the voting center, only to then secretly continue counting the votes once the observers were no longer in the building.
Honest men have nothing to hide. Criminals don't like witnesses.
