Fred, You should save those, because...................
they are RARE. As any numismatist knows, this is evedence of a "double-strike"
, as sometimes occurs at federal mints when a die strikes a coin twice. Those coins are supposed to be destroyed by the workers, but every now and then, a couple creep out.....
My recommendation is, that those cartridges should be placed in hermetically sealed display tubes, after wiping them down with a chamois made from vegetable-tanned Fruit Bat scrotums, to remove all traces of the chemical deposit made by your fingers. Do not get carried away and rub too long, or hard, as the rag'll turn into a tent, an' they're real hard to wipe with, y'know..............??
Those cartridges can then be carefully displayed in their tubes, at matches and other gatherings, placed safely under a glass display, so that the curious cannot pick up the tubes, and carelessly contaminate, or damage, those precious treasures.
If a custom display is financially beyond your means, you can carefully drive to a prominent area at clubs, shoots, etc, and place them conspicuously on your car's dashboard, so that the admirers can gaze at them through the windshield. Y'might wanta clean that windshield a tad. The difficult spots can be touched up with some J-B, or Iosso if ya like.
Have a good day.