Users archive - inbox and folders are empty

I have a few users whos archives are showing up as empty.

I use a Policy document to create archives of all emails older then 18 months, on an archive server.

In one case, a users archive is 680MB, but nothing shows up in the inbox or folders of the archive database.

All the emails are located under All Documents, but it would appear the folder information has not come through.

Can anyone suggest anything I can do to put the emails back into the appropriate folders?

Subject: You are most likely out of luck

In theory it might be possible to find a ton of backups, where the documents are still in folders, and restore the information from there, but this is most likely not practiacal