Nowaday, only VBoxGetIP is useful as a working script for this matter ...
- VBoxGetIP : returns current IP(s) of the running Virtualbox VM(s).
- startvm_headless_*.sh : to modify yet ...
- startvm_headless.sh : this script will show a list of VM configured in your Virtualbox (including the ones in running states), and let you choose which to start headless from the list.