A lot of these prototypes aren't that closely guarded. As a run-of-the-mill employee at Google I ended up with a bunch of random pre-production Androids and IOT

A lot of these prototypes aren't that closely guarded. As a run-of-the-mill employee at Google I ended up with a bunch of random pre-production Androids and IOT devices from the dogfood program. You were supposed to give them back most people I know didn't bother -- Google isn't a very threatening employer -- and I think I even accidentally gave some of them away with other old electronics when I moved. There was also a room full of to-be-recycled electronics in 42. It was open to employees so they could recycle personal stuff but it was absolutely full of (I assume non-confidential) prototypes including stuff that looked like it was from Google X. I was too scared to take any of this stuff but was really tempted to grab the carbon fiber gliders and weird nest devices.