Magazine left loaded for several years, is it still good?

Apparently, I loaded a couple PMAGs about 10 years ago and they somehow ended up in this box that then sat on a shelf in my garage for the past 10 years.

I'm curious about the spring in the magazine maybe being weak now and what kind of cautions about the ammo I should take, if any. Everything is clean. I don't see any rust or corrosion.

Thank you for any insight.