you have it in the right folder, push it back to your phone and boot it up just make a back up before hand. I dont think that is going to brick your phone though. Why dont you just root though it is a lot easier you can do all that on the phone itself.
it should overwrite the old one. There is another folder that the phone looks for bootanimations but i cant remember what it was (i know that doesnt help sorry). The original zip file was in your media folder right
Well unfortunately the only way to change your bootanimation is to root. Now I can tell you that yes rooting voids the 1 year warranty with Verizon but does nothing to the paid insurance you may have on your phone. Also in almost every case I have seen (with the exception of about 1-2) when a phone needs to be returned to Verizon you are able to unroot and Verizon has no idea that you did in the first place and thus the warranty is back in place. Now I am not saying that you should root, I am just letting you know that there are options to rooting that will not cause you much trouble. But pretty much any changes to the system (including bootanimations) can only be done if you are rooted.