Well I bought these boxes mostly because of the exp pots, scrolls and runes, one thing I noticed besides the +16 and +8 boxes is that the 100% 2 hour runes or the Golden Mermaid doesn't drop at all.
500 boxes
I didn't get +16 or +8 weapon box, Rune 100% 2 hours, Mermaid's Tears, IEWB, A or C, Talisman Baium and AQ doll.
I got 1 cloth and practically everything else from the list, but what I found very concerning and weird is that I didn't get any 100% 2 -hour rune or Mermaid's Tears.