@jphphotography: Besides taking a look over SSH, no, no way to tell. That said, I don't think it would hurt to launch both uninstallers (
yifan's, then mine), reboot, then install the latest jailbreak. If you suddenly can't uninstall/install anything, you probably got it. (The reboot part is key, there are slightly broken uninstallers out there).
As for the .bin files, yep, that was a 'feature' of the hack, it backuped every OTA update you got. You can safely delete them.
EDIT: That said, these OTA updates backup do give us a nice timeframe. IIRC, 515460094 was 3.0, so if you never touched the jailbreak after having installed the screen savers hack, that tells us that you used a 3.0 JB, which was nice, simple & dumb. They started getting more complex later.
That's a good news. That means you don't have anything to uninstall, you should simply be able to install the latest jailbreak on top of it.