DNC cape doesn't have a confirmed second location either.
I've actually heard rumors that there is no second location, and that was asked to the dev in the dynamis interview thing and they responded with "Working as intended" typical answer.
That, or it drops from one of the rarely-killed mobs from Buburimbu. It's a very wild guess, since that'll mean 4 possible mobs that drop them, out of which many of those are common to farm.
Crabs, Crawlers, Efts, Mandragoras, Raven and Scorpions are all missing a third listed item. If both accesories drop from bubu, then that's 4 mobs that could drop either for confirmation.
Out of those, only Scorpions and Crawlers are rarely farmed (By my group at least), so I'm very suspicious of SE at the moment.
It is better wither to be silent, or to say things of more value than silence. Sooner throw a pearl at hazard than an idle or useless word; and do not say a little in many words, but a great deal in a few.