Although your armor gets a bit messy, it's a simple matter to wipe it clean with a bit of clothing from one of the corpses.
Arrows - (1d3)[1](1) arrow is still good enough to shoot, and you collect it. You find no usable equipment beyond the one handaxe. You begin to suspect that the handaxe was left in the gnoll's face as either some sort of honor for the fallen creature or as a warning, because by the tracks, it is clear that there was a struggle between some humanoid creatures, four of them wearing soft animal skin shoes and the rest bearing short claws on their feet. With the gnoll corpse resting here, it's not a great logical leap to assume that gnoll bandits of some kind were behind this attack, and apparently were very effective, as the Bear tribe is not known for weak warriors by any stretch of the imagination. The gnolls' tracks continue on North through the woods. The ground is not terribly hard, and so tracking them down for answers (or revenge) shouldn't be a problem for you.