Purging and reinstalling (sudo apt-get purge virtualbox-ose && sudo aptitude install virtualbox-ose) does reinstall vbox.cfg.
The purging does appear to remove the manually extracted vbox.cfg.
Purging and reinstalling (sudo apt-get purge virtualbox-ose && sudo aptitude install virtualbox-ose) does reinstall vbox.cfg.
The purging does appear to remove the manually extracted vbox.cfg.