We don't know the exact process that is used. And there are system admin controls that could in theory allow an entire batch of blank ballots to be processed.  That Users Guide is a piece of crap.  So when you process a blank ballot does that mean you manually update the system to include the votes?  Likely.  Or, you never record the votes, but you can tie out the # of ballots processed to # of ballots reported and it appears that you met the basic control standard.