Use the Enterprise Vault Export Wizard 

1. Open the Vault Administration Console and expand the Archives container
    
2. Right click Archives, select Export...
   
   
    
3. Then choose Export Archives to their original mailboxes 
   
   
    
4. Follow the wizard through to completion

The above steps should have restored all items, from the archive, back to the original mailbox from which they were archived originally.

Note: This process will restore items that no longer have shortcuts in the mailbox.  Eg. shortcuts were previously deleted by the user but the associated archived item is still in the archive.  

Check the export report for any problem items, this is usually found in the Enterprise Vault Install location (C:\Program Files(x86)\Enterprise Vault\Reports\Export_***********.txt) the export report will be named according to the date of the export e.g. Export_20121002074055.txt (2012/10/02 07:40:55).

Command Line

This export process is also available using the Export-EVArchive PowerShell Cmdlet.  However, the export is directed to a PST file and cannot be directed back to the original mailbox. 

The information can also be found in the <install_path>\Enterprise Vault\Documentation\En\PowerShell_Cmdlets.pdf file on the EV server.