Pre-decimal presentation packs are quite prone to curling due to the fact that the cellophane used for these early issues tended to shrink. As the years pass, it is becoming harder & harder to find packs in perfectly flat condition. All of the packs I sell have their original cellophane undamaged, unlike some dealers who replace the sleeves with modern replacements. As such, some will have a slight degree of curling. I do not sell badly warped packs on my site - Those tend to be sold via Ebay at reduced rates to reflect their condition.