Saving Purchases To A Game?

I want players to be able to buy a product for the game, the amount of times they buy it saves (I know how to do that) but if they leave and a new server starts I don't know a way to find all the players bought it. I'm trying to make a raffle and I want it so the player doesn't have to be in the game for their name to be picked but I don't know how I could do this, is it possible and if it is please could you tell me how?