The LTO cases look to be of the soft vinyl type that prerecorded VHS tapes came in. The Osterhagen looks to be completeley transparent acrylic, check the thickness of the walls.
I'm gonna guess this was custom, proably laser cut pieces assembled around the key prop. Capped this pretty extensiveley, and there doesn't seem to be any openings.
There is, however, a keychain at one corner of the 'acrylic' box.
Very nice screencap... I would have to agree that it's clear acrylic. The cap that I had looked more translucent. Also, it does look custom. I guess we'll just need to wait for closer shots of the key.