by littlebro » Wed Jul 16, 2014 4:45 am
You get a Magic Roll and 1g.
The main point of it, though, is to complete the quest so that you are given a lot of persuasion points and gold by the thief guild.
For info like that, you can check my walkthroughs. I think I was pretty thorough in describing exactly what was in every chest and what items can be found.