What are the chances of dropping Wolf Backpack from mini-bosses of Edron and Cormaya?

Question

I used to kill them everyday during almost 90 days and never got a Backpack, so what are the chances?

Answer 1

I have research from two sites:

Shadowpelt (?) 

Black Vixen (?)

Bloodback (?)

Sharpclaw (0.29%)

Darkfang (0.28%)

• [source: https://tibia.fandom.com/wiki/Wolf_Backpack]

and

• Shadowpelt 0.45%
• Black Vixen ? 
• Bloodback ? 
• Sharpclaw 0.46%
• Darkfang 0.44%

source [https://tibiopedia.pl/items/Wolf_Backpack]