Drop chances

ItemStage 10Stage 50Stage 100Avg count
Rotting Flesh45%45%45%1.02
Bone31%31%31%0.68
Coal31%31%31%0.51
Charred Meat14%14%14%0.21
Hunting Knife4.5%4.5%4.5%0.05
Cooking Grill4.4%4.4%4.4%0.04
Grilled Meat3.4%3.4%3.4%0.05

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