Vaulted emails and delegations

Hi.  We have users who receive delegation to other users emails.  Our domain policy is vaulting the emails after 90 days.  When the user goes into the vaulted emails that have been vaulted under someone else's username, they are not able to download the attachments.  It seems like the text is viewable, but not the attachments - which is a big deal because a lot of what we do is being emailed to us in either pdf or jpg format.  We are using Ent Vault v10.2.  Even when the user is given the permissions on the exchange server for delegation AND permission to open the vaulted item, they still cannot get the attachment.  Has anyone else seen this before?  Any help would be greatly appreciated!