The evidence of Vawank in "The Kingdom of Heaven: Save 2" is a very useful thing in the game. If you want to obtain evidence of Vawank, you can get a bribe in the mint first. Once you accept the bribe, wait for Breth Leave alone. He would walk towards the entrance of the bunker and follow him quietly.
How to obtain evidence of the Kingdom of Heaven saving 2 Wawank
Once you accept the bribe, wait for Brace to leave alone. He would walk towards the entrance of the bunker and follow him quietly.
When safe, you can choose to knock him out or kill him. You have to fight him and pray that other guards won't hear the sound. After he died or was unconscious, move the body to a place where other guards were unlikely to find it. Then, plunder his body and take away the following items:
Breth's letter
Letters from Wawank
Record box key
Make sure to take all the evidence, which will make the next task easier.
Now, by night, the other guards will go to bed. Head to their main room, where they sleep and get a set of keys. These keys open doors to nearby corridors.
Once you enter, you will find the real secret mint where some people are making coins. Even if you try to urge them to leave, they say they don’t want to leave.
In that room, there are several boxes to plunder, one of which can be opened with the key you found from Brace's body.
In the box, you will find the Secret Mint Book, which is exactly the evidence you need to prove Vavwank's involvement. You can then take whatever you need from these boxes and leave this area. Just try not to get caught when you leave.