Do some cash shop items tend to retire forever? In this case, some of the variety sticker packs.
Like the Super-Deformed Variety Pack or Fruit Variety Pack for example.
They say nothing is ever 100%, end-of-story, sorry you're SOL, retired on here, so regardless of the item I'm always hopeful that someday somehow it'll be back eventually
As a more relevant answer, I feel like I've seen them come back during a sale or something? I'm not 100% sure on that one, but they can definitely come back in the Hustler.