Yeah, some series have limited numbers they give out a day.Oh they only have limited packs per day or something?
Those will say "Free Packs Claimed Day. Come back tomorrow for more."
And some have a percentage of how sold out it is.
And when all the free packs are gone, you can't get anymore, except through buying them, and even some of those series are limited.
Like The Orphanage is sold out. No more free or buying packs.