The Harry Potter film, starring Daniel Radcliffe, Rupert Grint and Emma Watson He added: “It’s a horrible thing to happen and I’m just hoping for its safe return.“The real worry is that the thieves won’t realise what it is.“It’s a hard item to sell, especially as there is lots of awareness now.“But they stole some jewellery too and I’m scared they won’t realise what the card is, focus on the jewellery, and throw it away. “That unique piece of work could just be destroyed.” He has previously told how he has only read one Harry Potter book, adding that he bought the charity story “mostly to help raise money for people less fortunate, so that the money could go to good projects”. The prequel was written in 2008, during Potter-mania They are confronted by two “muggle” policemen after a high-speed motorbike chase but manage to escape on broomsticks.The story itself was later printed in a run of 10,000 copies which were sold in bookshops.In 2008, the Telegraph reported on how it became the “fastest-selling short story of all time when the entire print run was snapped up in a single day”.Anyone who knows the whereabouts of the postcard, or who has information about the break-in, is urged to contact West Midlands Police. The postcard, photographed in 2008 JK RowlingCredit:Lefteris Pitarakis Pc Paul Jauncey, investigating officer, said: “The only people who will buy this unique piece are true Harry Potter fans.”We are appealing to anyone who sees, or is offered this item for sale, to contact police.”Rowling shared the message with her 10 million Twitter followers, adding: “PLEASE DON’T BUY THIS IF YOU’RE OFFERED IT. Originally auctioned for @englishpen, the owner supported writers’ freedoms by bidding for it.” Its owner, who bought the story at a 2008 auction in aid of English PEN, was in Bangkok when he received a phone call from his sister to say there had been a break-in.Thieves stole three safes stored at the house, which contained jewellery with links to his late father and the ordinary-looking A5 postcard containing a story by JK Rowling.The businessman, who wished only to be known by his first name of Hira, said he believed the “horrible” crime was opportunistic, fearing the people who stole it would just throw it away. “I’m not a huge Harry Potter fan,” he admitted. “But I took good care of it. The card never came out of the box. “It’s shocking for this to happen.”Sold for £25,000 at the time, the postcard is now thought to be worth up to £60,000. West Midlands Police have appealed for information about the theft, which happened between April 13 and 24, in the hope that “the appeal goes far and wide among Harry Potter fans throughout the world.” Speaking from his Birmingham home, the 47-year-old owner, who runs an investment banking consultancy, said: “It’s a bit of a shock and it took a little while for it to settle in.“I was away on business in Bangkok with Steven Seagal when the house was broken into. “I had a phone call from my sister and that was it. I knew the safes had been taken.“They pulled out three safes and one of them had the prequel inside. I’m not sure if it was targeted to take the story. It seems more opportunistic.“It’s a one off item and I had responsibility for it.” At the time, he described how he felt he had snapped up a “bargain”.A representative of Steven Seagal has not yet responded to a request for comment. The story itself is set three years before Harry Potter’s birth, and features the schoolboy wizard’s father, James Potter, and godfather, Sirius Black, when they were teenagers. A unique handwritten Harry Potter story, bought at a charity auction for £25,000, has been stolen in a burglary, amid fears thieves will dispose of it without realising its worth.The 800-word prequel, written on a postcard by JK Rowling to raise money for charity, was taken along with jewellery from a safe in a house in Birmingham while its owner claims to have been away on a Bangkok business trip with Steven Seagal.Rowling herself has issued a plea to Harry Potter fans not to buy the work, which is the only handwritten copy in existence. PLEASE DON’T BUY THIS IF YOU’RE OFFERED IT. Originally auctioned for @englishpen, the owner supported writers’ freedoms by bidding for it. https://t.co/ljEQyyj9yY— J.K. Rowling (@jk_rowling) May 12, 2017 It is one of series of spin-offs following the main seven Harry Potter novels, including West End play The Cursed Child Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.