I can verify that the oem config option of the desktop/live CD creates /var/log/installer/oem-id, as of the hardy 8.04.2 pre snapshot (build id 20090108.1).
I can verify that the oem config option of the desktop/live CD creates /var/log/ installer/ oem-id, as of the hardy 8.04.2 pre snapshot (build id 20090108.1).