I am having trouble with this as well. There is a dead redcoat inside right near the blood and bones, the only other body I can find outside is a guy who, is moving around on the ground in my game, that was found up by the tent across the river under an overhang. If I take the redcoat outside the cave, I usually hear a bear roar, but when I go inside the redcoat is back in his spot and the other guy doesn't move...
When I did this I didn't know much, Went in couldn't find the bear went to leave a blue coat was there went to loot him and accidentally picked him up then a promp to lure the bear came up went in threw him down bear popped. I suggest trying to leave and seeing if he was there so far I guess that was a glitch; him not being therel or i just walked past him. Other than that haven't seen a glitch figured the day one patch worked. Just keep trying till a blue coat is there throw him by the red coat boom bear.
Worked on the 2nd try for me, daytime. The body wasn't there the first time, but when I went away and came back, a corpse in a green coat was just inside the cave entrance. Carry him to the bone pile, and out pops the bear.
And do not sell the skins to the peddler!! He rips you off big time. Send them by naval convoy to Saint-Augustine. Naval convoy gets you $1500+ per skin, the peddler gives you $240.
If you upgrade the convoy capacity to max, you can get $23000 or more per trip.