This is a really dangerous thing to delve into even in a vigilante/research capacity because if you have any of this content even in  your browser cache or anywhere on your hard drive, and you take your computer someplace for service or it somehow gets searched by law enforcement, you are in deep deep deep deep trouble.  Deeeeeep trouble.  Even if you didn't know the images were on your computer, you're still gonna have a very very very hard time getting out of it.  You might want to just take that hard drive into the desert, set it on fire, burn it to ash, scoop up the ashes, jump on a boat, dump the ashes in the ocean, then set the ocean on fire.  Seriously.  I'm glad you got a lawyer, but still...burn it.  Burn it all.