The state auditor's office today released a report that found a nearly $102-million discrepancy over five years between the cash the MBTA actually took in through fare boxes on buses and trolleys and the amount those boxes said they were fed.

The MBTA said that simply reflects software issues, not massive amounts of theft or money rolling behind driver's seats, and the auditor's office says that's possible, but there's currently no way to know for sure: