Hi Solomon, I've no idea where the commas came from so it's a typo.  
When you get a Virtual Box image it puts the template for the image in your Windows profile somewhere.  If the box exists on the Hashicorp site it will detect if the template version differs from the one on the site and recommend that you run Vagrant box update.
If you get your box instance from another site you can tell Vagrant to package it up as a template so you can run Vagrant up.
I have had virtual boxes from many sources, not just the one mentioned in the article.  I've not always been successful when trying to package them up as Vagrant boxes though.  It's theoretically possible, I just don't know enough to do it reliably every time