A watchdog group has recovered thousands of missing emails from Lois Lerner, the former Internal Revenue Service (IRS) official who is at the center of the agency's targeting scandal.

Doug McKelway reported on "The Real Story" that the 6,400 emails stretch from a time period of 2004 to 2013, most of them coming from 2012.

"That's roughly a year after Lois Lerner's hard drive crashed," McKelway said, adding that the new emails were discovered by the Treasury Department's Inspector General's Office and handed over to the Senate Finance Committee last night.

McKelway reported that a House Ways and Means Committee spokesman said that this underscores that the investigation into the IRS is far from over.

McKelway added that the IRS released its own statement, saying that this release is "an encouraging development that will help resolve remaining questions and dispel uncertainty surrounding the emails."

The Inspector General's Office is expected to release a report on all these missing emails later this year, McKelway reported.

"The IG said back in February that it was also investigating 'potential criminal activity,'" McKelway said.

Watch more above.

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