iPad indestructible case

[ld9381]

Hi. My son has special needs and difficult behavior. His favorite possession is his iPad. Unfortunately, He hates having a protective case on it and breaks them off. We have tried Griffin, Otterbox and others. They say military grade, unbreakable, etc. but my son still is able to break them off, then of course the iPad gets broken. Is there a metal case that will "blend" with the iPad, that will protect it when dropped, but the iPad will not look like there is anything on it? Does anyone have any experience with MacLock? They are mainly for antitheft, but I'm thinking my son won't be able to break it off the iPad. Thank you for any help or for putting me in touch with an inventor.