It looks like currently when you set the corona autosave filename and folder within max it's saving that data to 3ds max itself rather than the max file. What this means is that when someone submits a network render job from their machine, say it's called machine01 and the corona autosave is set to machine01/autosaves/machine01_render_01.exr, what actually happens is that if that render ends up being rendered on machine05, it will actually pick up the corona autosave filename and path on that local machine05, NOT machine01, so it might well end up saving to machine05/autosaves/machine05_render_01.exr. This is very confusing indeed, because filenames and paths don't always (hardly ever, really) match the actual job/render name.
I've made that sound very complicated, probably. Crux of it is that corona autosave filename and path should save with the max file, not with max itself, so they will always be respected during network rendering, no matter which machine picks up the job.
Cheers,