First of all, non of elan quests contains box as reward for race bellato.
Other issues:
Quest [Lv50_NPC] Collecting wing sample of Polluted Big Ratmoth [3hours] - Big Ratmoth doesn't drop quest item
Quest [Lv50_NPC] Collecting poison sample of Sting Host Marr [3hours] - Sting Host Marr doesn't drop quest item
Other issues:
Quest [Lv50_NPC] Collecting wing sample of Polluted Big Ratmoth [3hours] - Big Ratmoth doesn't drop quest item
Quest [Lv50_NPC] Collecting poison sample of Sting Host Marr [3hours] - Sting Host Marr doesn't drop quest item