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*sigh* Nexon just gets worse and worse. This time it's one of those gamble boxes in the item mall. Advertised as a "collectors" box to help fill the in-game collection books which give you useful rewards. The boxes have mounts, wings and costumes plus the filler crap. But note it's older stuff, only the costume masks have not been seen before and costume stuff is very much the least valuable after the filler crap.
According to their forum, there have been multiple reports of 200 boxes being opened TWO HUNDRED!!! With no mount or wings, just the least valuable costumes in very, very small numbers and filler crap.
There is an element of luck involved of course, but from the reports and in-game popups, the drop rate on this box is just appallingly low. Shockingly so. It isn't even new, just re-cycled old stuff for the most part. It's pretty obvious that it's little more than a scam.