I see. So, in case i receive a new Golden ones, what do i do with those old blue and white ones?
You can send or get them to a local recycling facility. Visit the NYS Department of Environmental Conservation to see a list of such facilities.
Is there any security measure i must take regarding the plates disposal?
In fact, there are. You must make sure to separate your plates and put them in the recycle bin with some time between them, such as two weeks time.