three

Level 1 of the Dungeon
(0, 0, D:1)
  a +4 ring of protection
(1, 1, D:1)
  a +0 whip
  a kobold corpse (skeletalised by now)
(5, 10, D:1)
  a rat corpse (skeletalised by now)
(6, -5, D:1)
  a +0 club
(15, 10, D:1)
  a +0 short sword
(16, 24, D:1)
  a +0 whip
  a kobold skeleton
(20, 13, D:1)
  a frilled lizard skeleton
(24, 16, D:1)
  a hobgoblin skeleton
(26, 11, D:1)
  a +0 ring mail
(27, -4, D:1)
  a hobgoblin skeleton
(27, 31, D:1)
  a ring of flight
(29, -4, D:1)
  a +0 club
(29, 28, D:1)
  a +0 rapier
(32, 33, D:1)
  a ball python corpse (skeletalised by now)
(33, 37, D:1)
  a +0 club
  4 stones
  a kobold corpse (skeletalised by now)
(35, 35, D:1)
  a +0 dagger
(35, 37, D:1)
  a +0 club
  a goblin corpse (skeletalised by now)
(39, 0, D:1)
  a hobgoblin skeleton
(43, -3, D:1)
  a rat skeleton
(52, 32, D:1)
  a +0 club
  a goblin corpse (skeletalised by now)
(57, 32, D:1)
  a ball python corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  a throwing net
(4, -4, D:2)
  a +0 dagger