Hi,
Following topic could help (http://www.symantec.com/business/support/index?page=content&id=HOWTO77389)
2.3 - Deletion of Unused Packages
The setting for when Package Servers should delete unused packages exists on the Settings tab of the Package Server page.
The count down to remove package files on a Package Server will only begin when either; the package is unassigned from the Package Server, or the package is deleted from the NS database. Both of these situations result in the package no longer being sent down to the Altiris Agent in the Package Server node of the configuration XML file.
Once this occurs the Package Server updates the PackageStatus.xml file that it stores for each individual package and sets the ‘Status’ flag to ‘Deleted’ and the ‘Time’ flag to that of when it was removed from the configuration file.
The package status files are located (on a default install) at the following location on the Package Server machine -
C:\Program Files\Altiris\Altiris Agent\Package Server Agent\Package Status
At each Package Server refresh the Package Server will check for a Deleted flag inside all the Package Status files and if the corresponding Time flag has past the duration configured for deletion of unused packages, then the package files will be removed.