Thousands of Harry Potter books written for Comic Relief which had been due to be recycled have been stolen.
JK Rowling's Harry Potter books sell in their millions
Two pallets containing 3,000 copies were taken from The Recycling Company at Port Talbot's docks.
Fantastic Beasts and Quidditch Through the Ages were written by JK Rowling to raise funds for the BBC Red Nose Day charity appeal.
They were contained in red-coloured plastic satchels which police believe may now be offered for sale.
Thieves forced open shutters to gain access to the premises over the weekend.
The books had previously been available in shops with all proceeds going to the appeal.
The books taken from Port Talbot were unsold copies which were to have been recycled.
Police want to hear from anyone offered the books or who saw anything suspicious.
Phone South Wales Police on 01792 456999 or Crimestoppers anonymously on 0800 555111.