Some items that may be obtained in game by a player and then are thrown away are no longer obtainable unless restored by a GM but that is only under certain conditions. If you decided to throw away certain items years ago then quit the game and then come back years later a GM will not restore the items. These items I speak of include mission rewards such as the glory crown, nation flags that you put in your mog house and fishing rewards gained by doing the tenacity quests in records of eminence. I am sure there are other items out there that you cannot reobtain as well.
Now I don't want to complain about their item restoration policy. If I got to go redo things in game to get items back then ok. I certainly have no problem redoing things in the game to get items back and that is the way it is if you delete your inventory then quit the game and then come back some other time and want your stuff back.
My suggestion is that they make a way for a player to reobtain those items that cannot be reobtained even if it means redoing what was necessary to obtain those items.