the item through a simply chat bubble

If I were a dev, I'd do this just to save the GMs a huge headache. Can you imagine how many requests to restore lost Toy items will come flooding in after WoD begins, even with a lot of players deleting these items over 30 days prior?

For quest items, you should be able to revisit the quest reward giver to obtain another copy of free wow gold the item through a simply chat bubble.
For achievements, you would visit the NPC that sent you the in-game mail with the item.
For archeology, completing a rare would unlock the repurchasing of that item from an archeology vendor for a certain amount of keystone and/or fragments.