Undo

Level 1 of the Dungeon
(1, 33, D:1)
  6 gold pieces
(6, 21, D:1)
  a hobgoblin skeleton
(12, 0, D:1)
  a +0 dagger
(27, 15, D:1)
  a bat skeleton
(37, 8, D:1)
  a +0 mace
(37, 14, D:1)
  a +0 club
  a goblin skeleton
(37, 27, D:1)
  a +0 dagger
(50, 29, D:1)
  a parchment of Gloom
(50, 37, D:1)
  a +0 spear

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 ring mail
(3, 8, D:2)
  a +0 short sword
  a kobold corpse (skeletalised by now)
(10, -5, D:2)
  a +0 flail
(12, 41, D:2)
  a hobgoblin corpse (skeletalised by now)
(13, 21, D:2)
  a +0 club
(16, 43, D:2)
  a +0 ring mail
(27, 30, D:2)
  a ball python skeleton
(43, -3, D:2)
  a +0 mace
(45, 24, D:2)
  a frilled lizard skeleton

Level 3 of the Dungeon
(0, 0, D:3)
  a hobgoblin skeleton
(7, -12, D:3)
  a ball python skeleton
  a bat skeleton
(7, -7, D:3)
  a bat skeleton
(22, -18, D:3)
  a +0 scythe
  a +0 robe
(23, -21, D:3)
  a +0 ring mail
(28, -19, D:3)
  a +0 trident
(28, 12, D:3)
  a hobgoblin corpse (skeletalised by now)
(28, 16, D:3)
  a +0 club
(32, -17, D:3)
  a hobgoblin skeleton
(40, 9, D:3)
  a hobgoblin corpse (skeletalised by now)
(40, 12, D:3)
  a +0 dagger
(41, 13, D:3)
  a +0 scale mail
(50, -10, D:3)
  a frilled lizard corpse (skeletalised by now)
(50, -8, D:3)
  a +0 war axe

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 whip
  a +0 ring mail
  a +0 hand axe
  an orc corpse
  an orc corpse
(0, 1, D:4)
  a +1 trident of venom (still there?)
  an orc corpse (still there?)
(2, -6, D:4)
  a +0 whip
(18, -1, D:4)
  a +0 club
  a +0 leather armour
(23, -2, D:4)
  an adder corpse
(29, -14, D:4)
  a +0 short sword
(30, 7, D:4)
  a +0 short sword