Run a few hundred rounds through those mags if they are gonna be used in your carry gun. If they are just range mags I would just shoot them and not worry. I ordered two glock 17 17rd +2 mags from glock parts, they arrived and were LE Restricted mags from 1994. They had #4 followers in them, and I replaced them with #6 followers (I’m OCD). I just use them as range/training mags. There’s nothing wrong with them but I don’t like the way they seat in my glock compared to my Gen 3 Mags with #6 followers.
Glock is always very smart and very generous about these issues. Anytime they get the chance to remove old magazines from the field and replace them with new or at least rebuilt and tested mags they do it. It’s a smart move all around, the customer is happy and says good things about them and they lessen the chance of having to deal with a problem pistol later on. It’s also cheaper and easier for both parties to just ship mags instead of a pistol. It’s good policy and good preventative maintenance and helps protect their reputation for reliable pistols. Glock has great customer service.