I got these just a few days, maybe a week ago? Anyway it was rather simple. I didn't have the tree coffer, so i got some help from a 75 smn friend of mine, (Thanks Smeagle, you rock! =p) We spent about maybe an hour and a half to two hours looking for the key. Started out on Bark Spiders, to little avail, and moved on to robber Crabs. This was rather taunting since on the way to the crabs, we dropped right on top of the coffer chest -.o After a while we began to get agervated with the lack of drop =p Smn even used a Lucky Egg that we had gotten, no good. So he invited a thief friend of his to come and help out. lol As soon as the thf spawned into the tree and was in our party, smn and I got it. He didnt even make it to camp. Ran back to where we fell on the chest, traded my newly aquired key, and got me sme old guantlets =p After that rallied up some people from my LS, and we headed to Castle Zvhal to take on Dark Spark. I believe we killed him in like, 8 seconds? We all got tp off of demons, and ws'ed on him for some massive damage lol.
Anyway, I wish i would have read that I only neded to START this quest to open coffers for AF armor. Because the whole point of toiling to do it at 54 was so I could go get my Drachen Greaves, which I already had the key for. Amyway, I now have all my AF peices except for my Drachen Mail. Looks like i'll be bugging some people for a cauldron key really soon =p