RootsChat.Com

I live in Sydney, Australia and recently my mother bought a second hand book. This book was awarded to Arthur Buckle in 1906, at St Peters Church Thurston. I have done some googling and have been able to find out that Arthur Buckle (as long as it's the right Arthur Buckle) died in 1918 in the War, and is buried in St Peters Churchyard in Thurston. He was survived by his wife who lived in Canada.
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=122880003
http://www.everymanremembered.org/profiles/soldier/1740583/
I guess I am just trying to find out if he has any family left, and how on earth this book ended up in Sydney.
If anyone could shed any light that would be great. Thanks. :)