Maybe add grave robbers and scavengers who go around picking up loot in loot bags around the graveyard and random places that haven't been looted after a certain amount of time. Maybe one minute before the loot bag despawns. Make the timer long enough so that players who died can have enough time to return and pick it up.
Make them elusive and hard to chase down, but once killed they will drop whatever loot they've picked up along the way. After a while, more grave robbers and scavengers will spawn again, to do their rounds. The longer these opportunists are left alive, the more loot they're likely to accumulate.
Kind of got the idea from a late-80s arcade game called Golden Axe, where at night these tiny thieves with a sack on their backs would sneak up to the player at night as they camped in the wild. Kicking or swinging your weapon at them would cause them to drop useful items like potions.