Every batch of "unknown" brass I aquire weither purchased or pick up goes thru a very stringent inspection ! maybe even splitting a case down the middle to look at the possible incipient head seperation or sawing a suspected hardened neck (I can tell the difference how hardened brass cuts comrared to soft) then annealing a bit before using.
So while the precautions do have merit , we as handloaders have to develop steps in case prep ,just as in reloading steps to insure to the best of our ablitys our own safety !!!
If you ask for specific steps in brass prep or reloading procedures you`ll probably get as many different answers as responses ,but as long as the end results are clean/safe components our goal is reached.
I`ll add this also, my inspection process is very different for rifle & straight walled revolver brass !!