I purchased several thousand "once fire, processed brass" a few years ago. By "processed" I was told it was deprimed, tumbled, and resized. I was also told it was all civilian, and no military.
When my 9mm brass arrived, the first thing I noticed was that there was brass ranging from .380ACP to 10MM in the mix. In addition, there were military cases in the mix (quite a few), and the brass had not been deprimed. What was even more remarkable was that there were military cases which had had the primer crimp removed and expended civilian primers still in the pockets. (So much for "once fired".)
The tumbling also left a lot to be desired. The cases looked as if they were possibly thrown in a cement mixer for around 10 minutes. What amazed me most was there was no media present in the bags.
I notified the shipper (a supposedly reliable source for "once fired brass") and told him what I had received. He informed me that he had new help working and that his help wasn't "experienced".
He offered to send me 500 "real" processed cases. (I had ordered 5000, but when the smoke cleared there were less than 4600.) I took him up on his order, and I received exactly what I was supposed to receive when I placed the original order.
Have I ever ordered once fired brass since? No way!
If I need brass I order factory and make sure I specify that the brass be all from the same lot.