Unexpected Find

From: Mr. Black
Description: We have everything we need to open the backpack belonging to the authors of the threatening letters. The contents should lead me to its owner and to a bigger fish... I've managed to obtain the combination, but the lock is jammed. I need tools, will you lend me some?
Completed: I'm ready to admit that your absurd idea worked. But if it wasn't for my brilliant knowledge and skill of using encryption disks, it's unlikely we would've succeeded... The lock has finally opened. Oh no, the backpack is full of dangerous minerals! Quick, hold your nose, don't inhale their fumes!