When I am tracking stuff like this down I attach a bat file to the before sync and after sync events of the syncserver that will same a copy of all the wglogs, infiles, and outfiles.
xcopy F:\SlxLogging\Infiles\*.* F:\SlxLogging\_in\*.* /d/s/e/c/yxcopy F:\SlxLogging\Outfiles\*.* F:\SlxLogging\_out\*.* /d/s/e/c/yxcopy F:\SlxLogging\WGLogs\*.* F:\SlxLogging\_wg\*.* /d/s/e/c/y