http://xbox.nugnugnug.com
I checked out the Intellivision art on that site and they were from my old site! I made the screen shots and he stole them! And he didn't take the box art. (I don't care...I am just saying. It is kinda cool that all my hard work is still being used. Although, it did get a semi bad rating...)
I have box art for ALMOST all games. Some of them I have 2 or 3 different versions. Like different languages. If you would like those, let me know. I know most people don't play Intellivision on xbox or anywhere else unless they have the original controllers but...
J_K_M_A_N
Were you involved with the Screenshot Archive?
AFAIK, that's where most of the screenshots were taken from.
I'm the host of xbox.nugnugnug.com, although not the content generator/collector.
I've got a link on the site to the current home of screenshotarchive.com and I credit that page as the source and inspiration to the xbox specific content we provide.
If screenshotarchive got your work without you knowing it, then there's another layer of borrowing that you might not know about.
So however we ended up with your work, let me publicly say Thank You!

for your efforts! You've saved many people countless hours of slogging through ROMs, and I would *love* to have a set of the box covers too.
You could even create an account there and upload them, then credit will be tied to you for the remainder of the site's lifetime...
-jeff!