Archiving all items in a vault

A long time ago, I started putting items that I didn't need anymore into a vault that I called "Graveyard" because, if I remember correctly, at that time it wasn't possible to search in the Archive. When I saw that Search was possible in the Archive I moved all the items in "Graveyard" to it. But when I tried to delete the "Graveyard" vault, a message told me that if I did this, all the archived items from that vault would be deleted too. So I didn't delete the vault.

Is there any way to get rid of this unused vault but keep the items in the Archive?