I went back and posted the xbox.com boxart for all the games that I submitted that had boxart on xbox.com. For some of them, I do prefer the non-xbox.com art because it shows what the box really looks like instead of a more generic picture. Basically I provided both so you could easily use it if you wanted to.
Also, as I am sure you know, boxart varies based on the version of xbox.com being used so I explicitly stated which one I used even though you can easily tell based on the url.
Some of your images in their current state will not be accepted as covers. We are trying to determine which are reliable and which will be deleted.
Most of the time we want the covers from xbox.com, but for obvious reasons many games need to be found elsewhere. When they are found off a site other than xbox.com they meet some more fierce scrutiny. Bear with us.