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@FluffBall there's really not much point in going back to old levels just for choc box. I used to collect them alongside sugar track but you're best to just have a look at the levels coming up online to help you choose which collect chocolate to use. As @Freddy_Falkner says, the use chocolates are less than worthless and I don't even know why they exist! I don't know how many hours you spend per day but in 24 hours there should be opportunities to collect a full box on levels you play naturally (it counts collections even if you fail).
I suppose, in fairness now that we cannot build the bot as before, the colourbomb and striped/wrapped have gone up in value. I used to only play it for the lollipop. So it wasn't even worth using a lollipop to achieve it much less a ufo/party popper. Chumps I think Spieller was referring to (correct me if I'm wrong) are the ones that thought there was some major prize at the end.