Posted 30 July 2015 - 09:02 AM
This wouldn't really be something to check from a database, or at least not yet. The databases mostly don't keep track of whether an item is used in a quest. Maybe one not-so-legit database does, but the quests on that database might not even correspond to current iRO quests anyway.
What you should do is just look up the price of the etc item in ragial. Everything has a price to it. If it's vended frequently, has a high price, then keep it. Otherwise, just NPC it or not pick it up at all. It's mostly gears and cards that are worth anything anyway.
You can also just search for the item within the irowiki wiki itself to see if any quests use it. But really, every etc item is probably involved in at least one quest. Don't collect garbage and you should only really keep items that are used in repeatable quests that you personally frequently do (Seal 1, Mora), or items that can be used to create things that you use like Rune materials. Etc items in particular don't give you much zeny at all these days; most zeny is made from instances / quest rewards / MVP drops. Some people do greed in certain places and sell those off for zeny but that's a different story since your main focus is gathering items, and that's in BULK.