alinta gas shares lost how to find

i had ALinta gas shares, moved address(did not alert them to this) and received Divi's direct into my bank account so no problem their until last year when sold off. i do not have any records which is where the trouble starts....as i had moved i received no mail for when ALinta was sold off....what would of happen to these shares?????........contacted babcock and brown and they could not/would not help so who do i turn to??????...........where are they/who has them????????.....where do i go from here???????????.........ANy help grateful............regards simon