Neat work. I'm surprised he doesn't unbox the rolls in safe light. Having a roll inadvertently come unspooled in room light would be a loss.
I use to do some photographic work when I was young. Once I found a roll exposed film I had tucked away in the refrigerator. It was six or seven years old and I didn't know what was on it, so I developed it. It was a neat surprise, pictures I had taken of the second gas crisis in 1979 at the service station where I worked. The pictures came out OK but very grainy. I'm amazed at the quality of pictures he can extract from such old latent images.
At time 9:24, that camera is an Argus C3 ! That was my first 35mm camera.