Checking that cases in Classifieds are genuinely 'Once-Fired ex Factory'.

This is the question I posted today on an Ad.

"How does a potential buyer verify cases as 'Once-Fired ex Factory' when the original primers, burnt powder residue, and any chambering or resizing marks have been removed? I would like to know please.:-|

This is the Ad in question, which needs to be read from start to end for context.


The seller messaged me to discuss this in private, but I think an open thread would be more helpful for everyone.
Does anyone have a reliable method of doing this, or any comments? . . :-|
If they have been deep primed you can't tell
 
There's two types of cases on the sales: new and used.
Anything else is in the "one careful owner" territory and should be considered in one of the above two types.
 
Even worse than “one careful owner” are the dumpster divers who pickup empty cases off ranges. They then sort into batches of the same brand. Mostly these may well be “once fired” but how do you tell?

The only time I would entertain second hand brass was if i was shooting an obsolete calibre where brass is very hard to come buy, or cannot easily be formed from something else.

Frankly if you are penny pinching and want to use brass from unknown sources crack on and do so. But please don’t shoot it when next to other shooters on a range or in the field. If a rifle lets go, the shooter gets a big fright, but all the bits go sideways and ruin other people’s days.

I have once had an old Brno 22 long rifle with a major case rupture and got an eyeful of burning gases. It was uncomfortable for a few days. I have also been alongside a 300 winmag when a moderator was sent 50 metres down rang as the rear weld let go. The gas blast was very unpleasant.
 
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