btw, when reach items limit in character's inventory, and try to redeem reward from Jacques Peco, he will just take the coins and dont give u anything. remember to double check ur item limit before redeeming
This is an issue with some other quests too, afaik, some NPCs cannot count the number of items found in an inventory such as VIP res tokens giver.
A perfect solution would be to auto mail the items to Rodex if the capacity of the inventory is over the limit, but at this time it is too much to wish for.
Saying that, please make sure you are not sitting near the limit of your inventory. The limit is 100 unique items counting in all tabs.