I don't know who shot John, but I do know that that 7.7 case was fired in a .30-'06 chamber. I have a bunch like it that I fired in a M1903 Springfield to check out stories by WWII vets that they could fire Japanese ammo in the American rifle.*
As to the cases being "brand new", the labels clearly show they came from a reloading shop, so I think they got something mixed up someplace. Maybe they put a returned box back on the shelf without checking, I don't know. But there is no way a factory produced those short neck cases. Period.
*I did just that. No sign of any excess pressure, no sign of any significant case swelling, and even the clips work just fine!