I expect that what he is seeing is the crimp ring, which will have to be removed to reprime the brass.
I also found some brass at a gravel pit a while back, but because I wasn't sure of its condition (reloaded many times or not) or how long it had been in the elements, I crushed the neck with some pliers to remove the temptation to chance putting it in my new (and expensive) AR.
However, my non-reloading friends came shooting soon after and left me with a bunch of once fired brass!
Unfoutunately, most of it was crimped and I didn't have a tool to remove it. (now backordered from Midway) and I read on one of these posts that someone said to just use a 1/4" drill bit in a pinch.
Sounded good to me but all I had on hand was a 11/64 bit which came real close.
Between my homemade

crimp remover and my case neck deburring tool I managed to save all (262) but 18 of them (chrushed primers) using this method.
I say I lost 18 because I decided to straighten out a slightly bent decapping pin in my reloading die...SNAP! :angry:...and the pin too is on backorder from Midway....for what its worth...your mileage may vary...my $.02...etc.