On a Mac, they're tucked away in some Epson folder in a package in one of the Libraries; you'd have to locate it and do a control-click/Reveal Package Contents to find them. They're not in one of the Colorsync/Profiles folders. I'm not at home where I have my 3800 so I can't look at my setup at the moment to be more specific.
Now at home--here is where they are hidden:
Pro38.profiles is a package; do a control-click/Reveal Package Contents to get to Contents/Resources/