Did you make a backup of the state of the GSS server before you decommissioned it?
Here is an excerpt from a posting by one of the former Ghost developers:
For any version of GSS or Ghost Enterprise from about v8.0 onwards, download the script collection from its home page which will automate the process.
One of the scripts there is backupdb.wsf which when double-clicked by a user with administrative permissions will create a .cab archive of the state of the GSS server in a special directory under the "My Documents" folder.
Along with it is a corresponding restore script (which the backup script will bundle in the cabinet if they are run from the same directory), restoredb.wsf - dragging and dropping the backup cabinet onto the restore script will work to unpack a restore cabinet.
Prior to when I introduced encrypted passwords for the GSS database, copying server instances just involved copying files, but from GSS 2.0 onwards we introduced randomly-generated passwords to ensure the databases were completely secure; I developed a procedure for migrating GSS server instances posted on the Veritas official forums in 2006 (which you can probably still find in the KB archives) and in early 2007 I automated the procedure in these scripts, so it's pretty fire-and-forget.
The recommended way of moving GSS server instances is to use the scripts; the versions on Google Code which I have linked above are more up-to-date than the ones included in the product itself.