Where can I find a voice recording of Adam Lanza speaking?

I've conducted extensive research on Adam Peter Lanza's background, the perpetrator who committed the mass murder of 20 school children and 6 staff members at Sandy Hook Elementary School on December 15, 2012, and as much as I have searched, I just cannot find any sources of him verbally communicating what-so-ever. I've even searched the Sandy Hook final report documents released by Connecticut law officials, but to no avail can I find anything regarding what the emotionally paralysed boy has said out of his own mouth. If you are wondering as to why I am so desperate to find this out, well, I have a little bit of an obsession with this type of stuff, especially considering Adam Lanza was "somewhat autistic", according to his brother. I'm autistic myself, and I feel as if the two of us share quite a lot in common as far as personality traits, thought processes, and even physical appearance. All in all, I wouldn't mind knowing where I could possibly hear this kiddy-killer communicating, although he presumably never spoke too much anyway. Thanks for your time, a bid you adieu.