Sir Hans' necklace [SPOILERS] solved

[Bullwark]

I'm in the camp, spoke with the Baron and lost to all dice players. During the night I robbed them all of their dices. This way I found out about Mladota killing Sir Alphonse.
I also pickpocketed Blaha and stole a key.
In the Baron's tent I looted the chest, the barrel, him and his wench. No necklace anywhere.

The next day I accused all my former opponents of cheating and beat them. They ran off to the woods where I killed them off to fully loot them and check if they might have the necklace.

I ran back to Sir Anselm and told him about the murder suspect. He rewareded me with a green hat.

So where do I find the necklace? The bandits don't seem to have it. The Baron's gone after Sir Anslem got informed.

[vine]

I don't know if the spoils of dice tournament are still there, but there's a chest in passage "hidden badly" in the dice room. There's a guard that tells you of trespassing and game signals it for you as well.
I did the quest by participating in the dice game, persuasion option to enter for free as a guest of honour, and beat every one of them in game (my loaded dice and agility perk, no need for pribyslavitz boar boost). I picked my prize in the end from the chest to which i was entitled.
So go back to the camp and explore the dice room thoroughly and you'll find it. There's a passage underground as well that apparently is the escape route for the bandits, and you can sneak in and out through it if you wanna do it some other way if you load. Or next time..

[Larus]

Keep looking around the camp. There is another passage into the ruins where are guard is, or at least used to be, protecting locked door. It's accessible from the hall where the dice tournament took place iirc.

[Bullwark]

Thank you guys!!
I missed that part completely...!