Wait....he bought a wooden crate of ammunition, with sealed cans inside, and thought it was mass-produced reloads?
It sounds to me like he is the victim of his own stupidity. I suppose I could be a bit nicer and say it's his fault for not doing more research before making his purchase, but he really doesn't have room to be upset at the dealer he bought the ammunition from. At the end of the day it's the buyer's responsibility to know what they're buying.
Yugos M67. Considered one of, if not the best surplus 7.62x39 imported into the U.S. And yes its corrosive. Seems like recently some M67 popped back up from a handful of retailers, a little to pricey for me.