Hi Frances,
From National Archives Australia database search, I wonder if this, which appears to be related to WW2, connected?
Item details for: C123, 1101
Request copy
Title
MULLER, Lena [Security Service, New South Wales, dossier] [box 2]
Contents date range
1939 - 1940
Series number
C123
Click to see which government agency or person created this item.
Control symbol
1101
Item barcode
899229
Location
Sydney
Access status
Open
Date of decision
29 Oct 1992
Physical format
PAPER FILES AND DOCUMENTS (allocated at series level)
Date registered
11 Jan 1996
Mary