behind

Level 1 of the Dungeon
(9, 18, D:1)
  a +0 ring mail
(15, 17, D:1)
  a bat skeleton
(16, 18, D:1)
  a quill talisman
(22, 24, D:1)
  a rat corpse (skeletalised by now)
(23, -4, D:1)
  a +0 whip
(24, 4, D:1)
  a hobgoblin skeleton

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 club
(4, 12, D:2)
  a hobgoblin skeleton
(4, 18, D:2)
  a +0 dagger
(6, 10, D:2)
  a +0 club
  a goblin skeleton
(16, 40, D:2)
  a +0 club
  5 stones
  a kobold skeleton
(21, 36, D:2)
  a bat skeleton
(24, 40, D:2)
  a +0 leather armour
(28, 34, D:2)
  a +0 dagger
  5 stones
  a kobold corpse (skeletalised by now)
(29, 42, D:2)
  a ball python corpse (skeletalised by now)
(32, 10, D:2)
  a +0 club
(33, 10, D:2)
  a bat skeleton
(40, -3, D:2)
  a +0 leather armour
(40, 11, D:2)
  a parchment of Searing Ray
(51, 21, D:2)
  a quokka skeleton
(52, 7, D:2)
  a +0 robe
(60, 12, D:2)
  a bat corpse (skeletalised by now)

Level 3 of the Dungeon
(3, 0, D:3)
  5 javelins
(5, 9, D:3)
  a +0 hand axe
  a +0 scale mail
  a +2 dagger of electrocution