i did a level 4 (still only have 99.5 cart, have to go get me some more maps that aren't already decoded)
I got a skelly key, 6 essences of something or other, the tasty treat, altricity scroll (alchemy) and 20K
plus i just bag the rest for unravelling). No map though.
I was hoping the skelly key was something super cool rare. I just realize it helps with lockpicking. (goes to read about this).
PS Thanks for these threads, they are very helpful