Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 robe
(0, 1, D:1)
  14 stones
(7, 1, D:1)
  a hobgoblin corpse (skeletalised by now)
(7, 4, D:1)
  a frilled lizard corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  13 gold pieces
(11, 1, D:2)
  an adder corpse
(13, 4, D:2)
  9 gold pieces
(30, -3, D:2)
  19 bolts

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 hand axe
(13, -5, D:3)
  a +0 robe
(15, -12, D:3)
  a frilled lizard corpse
(15, -10, D:3)
  a +0 hand axe (still there?)
  a rat corpse (still there?)
(16, -12, D:3)
  a +0 club
(18, 6, D:3)
  14 stones
(24, -14, D:3)
  a jackal corpse
(26, -3, D:3)
  a +0 ring mail
(28, -10, D:3)
  a jackal corpse
(28, 1, D:3)
  9 gold pieces
(29, -10, D:3)
  a +0 dagger (still there?)
  a goblin corpse (still there?)

Level 4 of the Dungeon
[Shop] Liruack's Book Shoppe
  (Shop contents are unknown)
(0, 0, D:4)
  a ball python corpse
(1, 1, D:4)
  a +0 dagger (still there?)
  4 stones (still there?)
  a kobold corpse (still there?)
(30, 3, D:4)
  a +0 flail