I would think that chain of custody rules would already be in place. I don’t see how a “bag of ballots” can EVER be admitted after the fact. I think any precinct that produces a bag of ballots should have all the workers disqualified permanently and police lock down for the next election. If every vote counting is so important, then how can they pretend it’s no big deal to “find” ballots. Somebody needs to go to jail. Want to count your fraudulent votes, mr rat pig? Let someone go to prison for it. See if they keep their mouth shut.
If they are using a COC, then the person whose signature appears last is responsible.