Now i know (after doing the quest and seeing i wasted my time) that the quest its not do-able. So im posting to prevent to others this bug and hoping the Snowboard Coupon item is removed from the droping tables in Santa's Planetoid
I have this bug aswell, i started the hunting with 3 pieces in 1 char and 2 on the other char, the whole afternoon i was killing pigs and the char with 2 items got the remaining 3, but the one that had 3 pieces didn't even got 1, when they both were fighting at the same time, on the same party. The only difference was their level, the one who got everything was 7 levels below the other