Great catch! Something had to fall through the cracks, and we missed that in the final editing of the reward levels.
Yes. You get a signed print of the art on all RANDOM NPC and CANON FODDER reward levels, just like BACKGROUND CHECK and ZETA FOUR. Sorry for that omission. We'll correct that in the reward matrix and update that if we create new reward levels. Unfortunately once the campaign is launched, we can't edit the reward levels.
SIDE NOTE: This is also true for MONSTER ENTRY if and only if we create specific art for that monster.