The only other thing I can think of, is what did you put in for the search on trove? Although, then again, they'd rarely put something up, if it was a suicide.
Regardless. What are the dates that we are searching between? Perhaps we can try some broader searches. Just looking for Weston, or missing person. Often J. Weston, rather than James Weston. I like to force the search with the names together, like "James Weston" with the talking marks.