The unmarked brown box sat unnoticed in the Pinellas Supervisor of Elections office until Monday, two weeks after the election, when an employee cleaning a desk stumbled upon it.
Inside were 268 uncounted absentee ballots.
"I think this is a very serious situation," Supervisor of Elections Deborah Clark said Monday, vowing to fire or discipline any employee found to be negligent.
"I assume all responsibility for everything that happened in that department, but I have to rely on other people," Clark said. "It's not a one-woman show."
The unmarked box wasn't the only problem.
Five days ago, Clark sent the state the county's final results for the Nov. 2 election. But her office had failed to perform a standard check to ensure that all ballots had been accounted for.
Clark assumed her staff had performed the check, but they had not.
Now she will ask the state for permission to change Pinellas' official results. The canvassing board will count the missing ballots Thursday.
Although it is numerically possible, officials say the missing ballots probably won't change any results. Only a few races were decided by less than 268 votes - including the presidential contest.