I have been doing some organization of my ammo and shooting up the older and small quantity stuff. I noticed the packaging for CCI Mini-Mag .22 LR ammo has changed over the years:
The leftmost is the oldest and the one on the right is the most recent.
On Tuesday I finished off the box on the left. I suspect it was getting close to 20 years old. Every round fed, fired, and ejected without a problem in my Ruger Mark III.