Comment 2 for bug 108746

Based on the fact that the Ubuntu-desktop package (which provides the standard ubuntu/gnome desktop) depends on gnome-icon-theme but not on gnome-icon-theme-gperfection2, I would say the icon in the former package is the one normally used. Other than that, my guess is as good as yours... the packages listed are simply taken from the output of the command 'apt-file search stock_send-fax.png'.