Drop chances

ItemStage 10Stage 50Stage 100Avg count
Paper20%20%20%0.4
Cloth Fragment20%20%20%0.4
Bone14%14%14%0.27
Rotting Flesh14%14%14%0.27
Clay Soil13%13%13%0.27
Empty Water Jar13%13%13%0.13
Iron7.8%7.8%7.8%0.31
Short Iron Pipe7.8%7.8%7.8%0.16
Spring7.7%7.7%7.7%0.08
Mechanical Parts7.6%7.6%7.6%0.08
Murky Water5.5%5.5%5.5%0.05
Shotgun Shell (Ammo)2.9%2.9%2.9%0.12
7.62mm Ammo2.9%2.9%2.9%0.12
9mm Ammo2.8%2.8%2.8%0.11
plantedCorn12.8%2.8%2.8%0.03
.44 Magnum Ammo2.8%2.8%2.8%0.11
Duke's Casino Token2.7%2.7%2.7%0.2
Mega Crush1.1%1.1%1.1%0.01
Beer1.0%1.0%1.0%0.01
Vitamins0.85%0.85%0.85%0.01
Bandage0.80%0.80%0.80%0.01
Steroids0.77%0.77%0.77%0.01
Painkillers0.77%0.77%0.77%0.01
First Aid Bandage0.72%0.72%0.72%0.01
plantedGraceCorn10.30%0.30%0.30%0
Pistol0.29%0.29%0.29%0
Hunting Knife0.26%0.26%0.26%0

Average count per open at loot stage 50. From 40,000 simulated opens per stage; perks that raise loot are not counted.