Seriously, lost???
Check it out:

The IRS told lawmakers on Friday that former agency official Lois Lerner’s computer crashed in 2011, leaving it unable to provide some emails sent to outside government officials.

The tax agency added that it was almost finished handing over some 67,000 emails sent by or from Lerner, the IRS official who set off a firestorm in May 2013 by acknowledging that the agency had improperly scrutinized Tea Party groups.

But that explanation didn’t sit well with House Ways and Means Committee Chairman Dave Camp (R-Mich.), who called for immediate investigations by both the Justice Department and Treasury’s inspector general for tax administration.