Audit log doesn't bother mentioning who accessed the object

Hi,

I've configured our 2008 Server to audit object access.
I've enabled auditing on 1 testfolder to audit the "delete" action.

When I test this and delete the folder using one of our user accounts I get the output below in the eventviewer of our server. The problem is that the event does not mention which user account deleted the folder, which is all I want to know. It just mentions"logon id 0x3e7".

Thanks for reading !

Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          22/04/2013 10:34:21
Event ID:      4663
Task Category: File System
Level:         Information
Keywords:      Audit Success
User:          N/A
Computer:      myserver.mydomain.local
Description:
An attempt was made to access an object.

Subject:

                Security ID:                        SYSTEM

                Account Name:                               myserver$

                Account Domain:                            mydomain

                Logon ID:                            0x3e7

Object:

                Object Server:  Security

                Object Type:     File

                Object Name:   D:\DATA\TESTFOLDER

                Handle ID:          0x7460

etc.