PST Issue, Items missing during Move

Hey

Yesterday a user of mine needed to archive the sent items (outlook2003) which was 280mb , so i selected the emails that were to be moved to the archive and right click move to folder and i selected her archive.

I was notified today , when she goes to check the archived sent items none of them are there and i cant find them anywhere!

There was no error during the transfer. Is there any way i can find these emails or am i out of luck?

I even tried looking in recover deleted items… And nothing.

Please help if you know a way to retrieve these emails.