Mac OS X 10.6 Server user mail account rebuild

I have encountered a strange problem i have never seen before and it has me a bit baffled.

Current setup:

Mac OS X 10.6 server with the Mail service running and everyone using IMAP to connect to their mail. They are using apples mail client.

I have a user seems to have lost all his mail from his inbox. All the sub folders are still in tact but the inbox is completely blank. At first i thought the user might have accidently deleted all his email but that wasn't the case. I can confirm that the issue is not on the client machine as when i log in with webmail directly on the server, it shows the same thing.

I have a backup that is a few days old but i am hoping to avoid having to figure out how to copy the users mailbox back from that as they have a lot of emails that they have received in the past few days.

I have repaired the permissions on the server in case the mailstore had corrupted permission but this didn't work completely, i am now receiving emails into that inbox but all the previous messages didn't come back.

I am pretty stuck as to what i can do from here and any help would be welcomed