I was out of town when my package arrived, and the mags were pretty much as advertised. They were date marked from the late 70's to mid 80's (is this correct for IMI factory mags?) and all covered in a light coating of cosmoline. 5 mags displayed signs of minor pitting, but nothing that detracted from the finish. I'll use those for range mags when I get a Galil one of these days. But none of the mags had been used, and for $35/mag, I'm satisfied.
However, I was appalled by how they were shipped. They literally threw the mags in a flat rate USPS box. They didn't bother wrapping the mags in bubble or plastic wrap. So they were scraping against each other the entire time the box was in transit. Some mags had minor scuffs (nothing that penetrated the finish), but I'm surprised things didn't turn out worse.
I'd be hesitant to buy from Arms Unlimited again. If they were willing to ship the mags properly (and they came in the described condition), I'd consider another dozen though.