We’re experimenting using veewee to create our vagrant boxes. However, when we tried to regenerate them, the disk was never attached and the installation halted.
We tried deleting the whole VM directory to no avail, the disk still was never mounted. It was only after trying to mount it manually in the VirtualBox GUI that we saw that VirtualBox keeps a sort of registry of disks.
To solve the problem - open the Virtual Media Manager, remove the old disk and restart the veewee install process.