there's a 'setDeleted' command in the unreleased commands (atleast in 7.4 - don't have the 7.2 docs handy) - this might do the trick.
are you on windows or unix client ?
I'm on Windows XP. What input does the command take? System Pack DBKey or does it need more?
i don't think this command takes input - i think it looks for the dbkey in memory.
you can so something like:
blcli -Dcom.bladelogic.cli.debug.release-only="false" -m subshell
then check the ui.