Put chests on outdoor MOB's

You heard right. Why not have outdoor mobs have a small chance of having sealed receptacle on their corpse. Like the safe you get in the Biomere dungeon.

Have them have a 'self-destruct' mechanism on them that will cause it to explode if not opened, dropped, or destroyed within 1 minute.

Have them possibly trapped as well. An explosion, blind, or rollerrat trap could execute if not disarmed.

Open it up and have a single item appear in your inventory from the basic chest loot table.

Just more variety to help enthuse people to group outdoors.