Ok, i am on the Bal Molagmar quest for the Thieves' Guild. Unfortunately, i find myself stuck.

I am at Venim Manor, and have searched EVERYWHERE for the amulet. I finally had to consult the walkthrough for help. It said it was in a chest in the Guards' Chambers. However, there were only two amulets, an Extrodinary Amulet and a Extravegant Amulet. Neither was the one. I pickpocketed both guards in the chambers, they did not have it

Where is it?? Lol

All I can remember is that it's on a chest (not inside a chest) in Guard quarters

I don't remember the correct room though

Well there is a give away. It is the only one with a locked door. 3rd or fourth down on the left IIRC.