This is a fascinating evidence video I found this morning of a deputy apparently documenting evidence at the Lanza residence with a video camera (this is claimed to have been filmed after the initial raid, as is implied by a damaged garage door and some other signs of ruckus from within the building). One interesting object shows up at the 19:08 timestamp, being the hard drive that is said to have been destroyed by Lanza before the shooting. Other notable things that are shown include unopened packages and mail addressed to Nancy Lanza, an individual, unspent bullet cartridge on a room's carpet floor, a gun safe that was left open, an opened computer (Adam's, where the hard drive came from), and an empty box of disposable earplugs used for firearm hearing protection.
Near the end of the video, a substantial amount of footage is redacted as the deputy films a few of the upstairs rooms, like Adam's mother's bedroom. I'm assuming that the justification for some of this redaction could have to with the narrative that Lanza shot his mother to death in her bedroom while she was sleeping.