Lawford Lass

Hi, new to Perth Poms. I know this questions has already been asked but how can I prove to centerlink that my 17 year old has had all his childhood immunizations as they wont except the red book (which I cant find anyway). We have been here for 7 1/2 years. Recently separated and issues with ex meant I have had to re apply for family assistance. I know I only have until the 30th to prove this.