Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 club
(5, -7, D:1)
  a +0 robe
(16, 2, D:1)
  23 sling bullets
(19, -10, D:1)
  a bat corpse

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 whip
  4 stones

Level 3 of the Dungeon
(0, 0, D:3)
  a rat corpse
(14, -21, D:3)
  a +0 club (still there?)
  a kobold corpse (still there?)

a sewer
(0, 0, Sewer)
  a +0 dagger (still there?)
  a kobold corpse (still there?)