Also, don't forget the Superuser or SuperSU app, too, which might be a tell if you're trying to make sure there's no vestiges of root left over.
You'd also have to very carefully delete these things in the proper order and probably do them from a rooted shell (start shell, remount /system as read-write, remove busybox (I'd use the busybox uninstall feature), remove SuperSu or Superuser, then remove the su binary).
You might look in and/or start a thread in your device's home all-things-root forum:
Note: I don't know if the L9 is running JellyBean, but I believe Chainfire's SuperSU runs a portion as a daemon installed in the install-recovery.sh script, so manual removal is a bit trickier.
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