WTH is with Treasure Boxes

Just like the subject says: WTH is with Treasure Boxes?

I tryed it out just for the heck of it even though I know right now higher chests give less adena as if a same lvl mob kill.

That ain't the point though. My Unlock still is upto date. Bought about 100 Keys to thief. Not a single chest opened for me. They all disintegrated. Switched several areas. Same crap.

Anyone else having problem like this?

Dont waiste your adena on keys. Your unlock skill IMO is a waiste of sp. I have seen them open but you will never get back what it cost for the keys to open it. Only open them with the special keys that the mobs drop 100% success rate then.

This is what I have seen so far-- Treasure Boxes only open with those dropped grade keys, not the type of keys that can be bought in the store.

Treasure Chests, which are found elsewhere, don't open with grade keys and only open with Keys of Thief.

This is asinine, but oh well.

Thanks for the info.