The early balloting sites are run just like the election day sites - votes are accounted for, audits done,  total ballots issued to the site accounted for, ballots used, ballot machine tallies printed, signed, cross referenced and reconciled.  Questioned ballots are segregated, tallied and accounted for.  The security seals are cross checked for integrity, ballot "chutes" checked for wayward ballots.  Quite a process.