Second search found nothing.
First search however (only "*.sav") found this:
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0038.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0040.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0041.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0042.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0043.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0044.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/autosave_0045.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/manualsave_0039.sav
./Library/Application Support/Steam/userdata/100857628/20920/remote/quicksave.sav
./Library/Application Support/Steam/userdata/100857628/72000/remote/cloudsave_closure_001.sav
As you can see, I finally found a way to delete the saves ingame (fn+backspace).
Wasn't sure this works, cause fn+f9 doesn't quickload.
Not sure, the last entry is from Witcher 2 though.