Yeah, unfortunately between the small size of the existing box and the linen texturing, I don't think it's possible to get the detail required for a 16x16 cover (not to mention sides) straight off it.
Mostly I'm crossing my fingers that they made, and someone got and kept, a decent press kit. 2012 is late enough that's at least possible.
Even Élise Plessis's site
, which has a ton of high-res Oniverse art, doesn't have anything for Urbion.