Help to lock droid volume
From Android Wiki
I have been looking for a way to keep my volume locked.The volume rocker on a droid is easy to accidently lower.the best I found is an Android app called ring guard.there is another called volume locker that I heard of but haven't tried.I hope this is helpful.
This is no forum you will very probably not get any answers here.
1.) buy a full body protector or another type of case
2.) if it is absolutely not findable you can try to disable the hardware buttons by modifying files in ..\system\usr\keylayout\ via ADB at your own risk.
Then you should be able to control the volume with apps like button saviour