Hello BAC3
I've just come across this conversation. I saw my name mentioned in one of the replies, and I do remember being contacted about a Parkhurst boy at one stage. I'm not sure if it was this one though - I am not involved with the Esperance Bay Historical Society, but with the Esperance Museum, specifically the archives.
I have an extensive list of employees of the Dempster family in Esperance, and have not come across Richard Kirby as yet. However, James Robert Sinclair was in Esperance at one stage, and it could be that Richard came here with him. The Sinclairs worked for the Dempsters.
As for the Roebourne move, the Dempster family had business interests up that way as well, and there were other employees who also made similar moves. So while Richard Kirby isn't on my list yet, I wouldn't rule him out as being an employee of that family - there are still resources I haven't looked at and he could be named in one of those.