About the new yellow Health Insurance card

Hi, so I received some days ago the new yellow Health Insurance card that, as far as I understand, is just a temporary card before they issue the one in which health insurance and MyNumber are combined.

The thing that I don't understand is: what do I need to do with the blue Insurance card that I had until now? Do I have to just give it at my workplace? Just as it is? Or I dispose of it myself?

The paper that arrived with the yellow card just explain what to do if you don't have a MyNumber card yet (btw, I already have it), but not exactly what to do with the old Health Insurance card…

by Simo-Yuki