Hello Frederic,
I've attached a copy of the 464 Sqn ORB for the night 10/11-May-44. You can search through the digitized records of the National Archives Australia online, via the link:
http://recordsearch.naa.gov.au/Searc...sicSearch.aspx
It can be a bit hit and miss, based on what documents have been scanned to date. I entered 464 Squadron and the period 1941 to 1945. It came up with several pages list of documents. Hit the "digitized file" column header and it moves all the scanned files to the top of the search list.
Good luck and happy factophiling,
...geoff