I track rifle cases by keeping them in lots of 20 or 50 (depending on the cartridge and type of boxes I have).
New, old, covered in mud, tarnished beyond belief.... it all goes in the same box.
I haven't actually had a case fail in several years. I lose them (in rocks/grass/sagebrush/mud/snow) before they have a chance to be reloaded enough times.
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."