What did you expect from the chest...? 150 of each gem except dragonstones in 40 keys.
I used 200 keys and got 20 black dragonhide and 20 red dragonhide, the rest was emeralds/sapphires and the 6 lowest lvl herbs. Only decent thing I got was 300 grimy toadflax, other than that it's not even worth mentioning.