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A quick dash at Google . . .
Some sources report that there were some 600 coast watchers, others report a count of 700; of whom, regardless of the total serving, 38 lost their lives. Using the lower number, that is about a 6% loss rate. See anzacportal and Navy.gov.au from which you can download this PDF article on the subject and coastwatchers presents four pages of individual vignettes and short historical essays.