Actually, for its age, the one at £9.99 isn't too bad, and the seller is accepting Best Offer. If you're a collector, I'd snap this up whilst you can (offer a lower price and cite the condition of the box - the seller is likely to accept if they want to get rid of it).
It looks to me like it's just crinkled/dog-eared around the edges - there doesn't seem to be any staining, discolouring or permanent marks (or worse - botched attempts at repairing the crinkles using sellotape. Urgh!). If you're comfortable with refurbing, you could open the box out carefully, iron it under a towel and then glue it back together.
Meanwhile, you could always have it in your collection whilst looking out for one in better condition, and then sell it on.
Just a suggestion. Good luck with it!