Efficiency

Level 1 of the Dungeon
(12, -13, D:1)
  a +0 dagger

Level 2 of the Dungeon
(0, 0, D:2)
  14 arrows

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 scale mail
(1, -9, D:3)
  7 gold pieces
(6, 3, D:3)
  a giant cockroach corpse
(11, 15, D:3)
  a leopard gecko corpse (skeletalised by now)
(15, -4, D:3)
  a ball python corpse (skeletalised by now)
(16, -7, D:3)
  a +0 dagger
(16, -4, D:3)
  a +0 club
(21, -24, D:3)
  6 gold pieces

Level 4 of the Dungeon
(0, 0, D:4)
  8 gold pieces
(2, 10, D:4)
  a +0 dagger (still there?)
  a +0 dagger (still there?)
  a cursed +0 robe (still there?)
  a poisoned dart (still there?)
(7, 10, D:4)
  a potion of ambrosia
(10, 5, D:4)
  9 gold pieces
(13, 15, D:4)
  6 gold pieces
(26, -21, D:4)
  a poisoned dart
(27, -21, D:4)
  a poisoned dart
(31, -21, D:4)
  a poisoned dart (still there?)
  a worker ant corpse (still there?)