A 77-year-old wartime diary has been reunited with the family of its late owner after being found on the floor of a supermarket in Australia.Margo Cooper died in March 2011 but her diary, written about her time in the Women’s Auxiliary Air Force in 1943, was discovered on the ground in a shop in Gordon, Sydney.The collection of poems and photographs was handed to Kuring-Gai Police on May 20, sparking a nationwide hunt to find Mrs Cooper’s family.