For an example of how pre-sim ("career") stats look in the Cato output, go to:
http://www.fibb.net/Cato/index.html
Years 2003 - 2005 are simmed, but the player pages have pre-2003 stats on them.
If you're not getting this result from your Cato output, something's wrong. My first suggestion would be to download the csv exporter from Cato's site and use that one, not the one from CommishJoe's site. CommishJoe keeps his exporter updated for certain BOSI features and some of the new data is not handled gracefully by the Cato utility. I don't recall it affecting career stats in particular, but it would be a place to start.