MESA COUNTY, Colo. (CBS4) – Election officials in Mesa County say they found 574 ballots from the November election in 2019. The ballots were never picked up.

In fact, they were forgotten in the ballot box outside of the Mesa County Elections Office.

READ MORE: Denver Man Sentenced For Killing Mother While Children Were Watching

The Mesa County Clerk, Tina Peters, says the office is still trying to figure out how it happened.

Mesa County Clerk Tina Peters (credit: CBS)

“I’m reviewing video to see what exactly happened. I have a colleague coming in from the Secretary of State’s office this weekend. We’re going to be laying out best practices,” she said. “I will work tirelessly to make sure that this never happens again or anything like this.”

File photo (credit: CBS)

READ MORE: Hospital In Leadville Upgrades, Expands Despite Recently Being On Brink Of Financial Crisis

Peters says on Election Day, ballot boxes are checked throughout the day, and they should be checked several times in the days that follow.

RELATED: CBS4 Campaign 2020 Coverage

Campaign 2020 Resources

See a list of important dates in Colorado’s 2020 election cycle.

MORE NEWS: Denver Police Chase Ends On I-25 With Arrest Of Man, Woman

Register to vote through the Colorado Secretary of State’s office.