you should be fine by re-locking the bootloader with a custom recovery. i never heard of that. if you re-lock the bootloader i believe that it will go away.
but that is not to disway you on getting s-off though. we can still help you with that, if that is what you wish as well.
I got an S3 as a replacement for now and am just worried Sprint will determine my problems are self inflicted after realizing i had root.
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. But feel free to try it and see what happens.