Question mark boxes and yellow butterflies

I assume this is part of Rainbow Week but I didn't see anything about it in the notice. Anyone know what they're for?

It's for Wednesday's scroll event. No idea on how many you need though.

they sumtimes give yellow butterflies, which can be exchanged on the Yellow Day (Wed i think) for scrolls. look in the event page for Rainbow thingie.

10 butterflies for 60% scroll
15 butterflies for 65% scroll

-- edit --
kay after they edited their banner, its trading in 10% and 60% scrolls for 15% and 65% scrolls LOOOL! it was so ambiguous before ;x i wonder if its 1 butterfly per trade.

damm that '%" and "and" addition in the banner makes all the difference LOL! i fee bad for ppl who bought 60% scrolls thinking they can trade 10 for 15 ;x

Opening those boxes is so annoying. You cant put them on any key like the envelopes so you have to open them one by one by clicking

they sumtimes give yellow butterflies, which can be exchanged on the Yellow Day (Wed i think) for scrolls. look in the event page for Rainbow thingie.

10 butterflies for 60% scroll
15 butterflies for 65% scroll

Are you sure about that? It seems to good and easy to be true.... Getting the butterflies from boxes aren't that rare. I have about 150 butterflies stocked up on a character. So if you need nothing else than butterflies to exchange for a scroll, then the scrolls are going to deflate even more.

Nexon word things wierd... So not sure how it's supposed to work. Exchanging 10 60% scrolls for 15 65% ones seems a little off on its own, but it might be a ploy to get rid of the overly stocked scrolls lying around from the black sack glitch.

they sumtimes give yellow butterflies, which can be exchanged on the Yellow Day (Wed i think) for scrolls. look in the event page for Rainbow thingie.

10 butterflies for 60% scroll
15 butterflies for 65% scroll

Uh no.

10 butterflies to change a 10%/60% to a 15%/65%.