Can the ballots be accounted for? In other words, does each ballot have a provenance?

Once a ballot enters the ballot count, it is good….But did it get there in a non fraudulent manner? Was it mail in vote? If so, was it a real mail in vote? Or was it one of the many that apparently were turned in last minute?

If a “normal” vote….did it appear after the polls closed?

Is there any way to tell real from (possibly) fraudulent?

Asking for a friend.