Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
I think you can restore your purchased items for the game though your account in the store.
Saved free boosters seem to be able to get lost as they appear to be saved on temporary files only, so if you update or reinstall a game, these can get lost.
What you could do is use them actively and not save them up. Trust me, been done, done that. Won't happen to me again.