First, I take no responsibility for what you do to your phone. If you are not comfortable digging through the /system directory do not try this. If you are, this should solve your problem.
If i understand you correctly you would like to get rid of the Sprint boot animation. To do that you need to remove these files from /system/media.
Now let's get rid of the audio "ding" in the boot animation. Remove the following files and folder from /system/media/audio/ui.
All you should be left with is the standard Samsung boot animation.
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