I personally have tracked 19 War Chests, all 100% participation. I have always had 1 or 2 token rolls. There is another project here on the forums where the person (ierazo) tracked 69 chests. Again, always 1 or 2 rolls.
This last chest 0 tokens. See image below:
I know it is just a token or two, but with loot what it is these days, missing loot is missing loot.