You may have the wrong directory on MOX.
You mentioned going into your logs and seeing only launcher, is that in Program Filed>SWTOR>logs?
Because combat logs are usually saved in My Documents along with screenshots etc, for example mine is in:
Libraries>Documents>Star Wars - The Old Republic>CombatLogs
All your combat ogs should be in there, and make sure you set MOXs directory to there aswell. Hope it helps
tbh i think his problem might be a simple matter of enabling combatlogs in game, this is prolly why he dont have a folder yet.