To view a report on deleted leads go to Manage > Administration > Logs > Deleted Leads. 

The Deleted Leads page will display a report of your deleted and restored leads:

To view only the deleted or only the restored leads select either of these options in the top-right corner of your report, and the report will refresh automatically:

To restore a specific lead click on the Restore button for that lead:

To restore multiple leads, select the leads and click the Mass Restore button in the top right corner of the page:

In both cases, a pop-up will appear that allows you to select the settings to be applied to the restored leads, as well as select the assigned users:

After selecting the lead options click OK and the leads will be restored:

Note: Deleted leads are removed permanently by the system after 30 days.