The box itself was updated to buster a while back, but I noticed that
the comment still says stretch. I also got rid of the vboxfs bit; IIRC
there were separate images for these at one time, but they are no longer
needed.
Actually, a far older historical artifact is still in this comment: We no longer use our own snapshots of the official base box... we just use the official base box... Oh well.
The box itself was updated to buster a while back, but I noticed that the comment still says stretch. I also got rid of the vboxfs bit; IIRC there were separate images for these at one time, but they are no longer needed.