Auto delete setting of trash older than 9999 days being ignored by nightly user upkeep

Using groupwise 7.0.3 at the server and the client side
Setting the auto delete of the trash items older than 9999 days at the post office and locked at that level , is being ignored by the nightly user upkeep and mails are deleted from the trash even if they are not older than 9999 days
Setting auto delete the trash items older than a lower value eg 965 days , works fine
No problems faced with groupwise 7.0.2 at the server and the client side

Reported to engineeting

Steps to duplicate :

Use groupwise 7.0.3 at the server and the client side
Launch console one and right click the post office---->Groupwise Utilities ---> Client Options ---> Environment---> Cleanup ----> Empty Trash --> Automatic after 9999 days.
Save the changes and get the setting locked at the post office level.
Let the nightly user upkeep run and you will find that , trash items not older than 9999 days are also deleted from the trash

No problems faced                                           

Workaround :

Set the number of days to a lower value eg 965 days and the nightly user upkeep will not delete the mails from the trash which are not older than 965 days