Pardon my incredulity, but really...what is all of the hulla-ba-lou about "once fired cases"? Tell me how to know, without a shadow of a doubt, which cases are and which cases are not once fired. If you believe the ads that cases for sale are "once fired", then, IMO, you are seriously fooling yourself.
I have fired THE SAME (pistol) cases DOZENS of times with no unfavorable results. I cannot tell them from once fired after cleaning and polishing. I am not pushing the threshold limit of maximum velocity/ultimate steel strength and I am not mic'ing every case for SAMII specification dimensions either.
Range pick-ups are just that. You cannot tell which are and which are not once fired, unless YOU are the original shooter, and your offering of those for sale is a matter of trust between you and the purchaser, which is fairly freely given on GBO Classifieds.
however, everyone should remember Caveat Emptor (Let The Buyer Beware) on "WTS 'Once Fired' Case" classifieds as I am fairly certain that they are not.
That reminds me, WTH is the big deal with MORE THAN ONCE FIRED CASES?