'Fraid you can't as yet. It involves editing an XML file that's only accessable with root access, which hasn't been achieved for the Sprint handset yet.
My experience (with the Galaxy): the sound file is built into the firmware, so your only options are to enable silent mode before rebooting, or using a headset (or dummy plug) to mute the sound.
This should be in the Sprint Hero section. I started the thread before the Sprint forum was created.
And I did get rid of the startup sound by loading the Nexus bootscreen in Fresh Pre-Kitchen after rooting.
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