The orc died within the last day or so. It isn't spring fresh or anything, but it hasn't had much of a chance to start rotting. Looking around, and being deliberate in your search, you can see that he probably came up the stairs opposite the ones you used. He likely was mortally wounded, but was still able to retreat to the top floor, where he expired.
Elyse searches the orcs body and sees that he is dressed in ceremonial robes for some infernal power. However, the ceremonial gear (the robes, staff, and unholy symbol) are not magically imbued. However, you find three interesting things. First, he has a coin purse containing 59 gp, a magic scroll, and, much to your surprise, a small golden sword! As with the other token, it seems to "want" to be returned to its pedestal.