In order to benefit from base updates you should symlink the Vagrantfile to the root of your project:
ln -s dev/basebox/Vagrantfile .
You could also copy this file instead of symlinking, but this would require a manual action to update which is not recommended.
The configuration of the Vagrantbox should always be done in
A default is provided but should be copied/renamed to the root of your project:
cp dev/basebox/Vagrantfile.local.dist Vagrantfile.local
You should change the parameters (e.g. ip, hostname) to match your project before booting.