I'm a U.S. Colecovision collector too, and I've been able to use only a few of the cover scans here. I've been doing Google image searches for U.S. box fronts, then printing them at 5X7 (which will fit into a UGC). Then, I use the side and back of the CBS covers here to make a decent looking cover. The backs of the CBS covers here are pretty similar to the U.S. retail backs, although the sides are quite different.
I did find high quality scans (front, back, and side) of U.S. DK, DK Jr., and Carnival at:
http://www.colecoboxart.com/index.htmlUnfortuantely, they're not sized for printing for UGC's, so it takes some trial and error to get them right, As you can see, mine aren't all quite the same size. But, I'd rather have the U.S. covers that I like even if they're not perfect. The Zaxxon was my fault - I missed a step when I printed it. I'm going to re-do that one soon.
Since I don't own any CV games in their original boxes, so I can't scan anything to add to the database. Also, I noticed that the Popeye CV cover here has a picture of the Intellivision version of the game.

