You mean the booklet yellowed or the casing?
Mine was second hand from Dora's store and I've had it for about a year but it's not discoloured or anything. Is it possible it's been exposed to too much sunlight or moisture? Heat from the sun could lead to some ageing of the plastic if it was very hot and was over a few days in a row...it's happened with other non-Ayu albums I had!
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