Got my 14 in (I'm only keeping 7 for myself, the other 7 are for someone else). They are in decent shape. "As described" I would say. Almost all of them had a little bit of rust around the feed lips and side plates at the top. Nothing that shouldn't clean off and just leave minor pitting. They'll still function. They will just be beater range mags.
I bought some mags similar to the condition of these from Centerfire Systems a couple years back for $5 a piece and I brushed all the rust off of them. There was some ugly pitting on most of them, some even on the front lock in point and around the feed lips, but they all function fine. Testament to the reliability of the mag design...
So here are the AIM mags-
The last pic is a good representation of what you can expect from these mags. A few of the mags I got didn't have any of the rust/pitting, but some had a little worse than what is shown in the last pic. What's shown in that pic is "average" for this lot of mags. It shouldn't affect function in the least.
Haven't cleaned them up yet. Won't have the time or facilities for a couple weeks. I'll let you know if I run into any surprises when I do.