I’ve bought between 1500-2000 cases in various calibers. Yes, there are sometimes few headstamps that are different (I.e. purchase W-W but find a few R-P), or a 270 in a 30-06 batch. I’ve also found a few split necks, but no issues with primer pockets except maybe less than a handful in over a thousand. I’m pretty sure you would find that many loose in new brass. Another issue I had was necks splitting on my first or second firing. Never had necks split so early on in their lifecycle. I started annealing all the once-fires brass I purchased, and haven’t had any issues since.
As others have said, I believe the brass is a great bargain and will buy again if needed. You just have to take the time to go though it.
