Hi hoping somebody may be about to help me find the needle in the haystack ?

Ideally i would like to find a Stanley DAY who in 1943 was in the royal navy , and would have been in Fremantle port Western Australia in June to August 1943

Unfortunately i have very little information due to family court rules in Australian , its take 80 years to release affidavit from the courts naming Stanley as my Grandfather

Its also impossible to source records identifying what ships would have been in Fremantle port in June / August 1943

I believe HMS Atreus was a frequent visitor and hoping to source a crew list and rule this ship out

any help would be most appreciated