Pam.
Those are so beautiful and especially precious because your grandma made them. I know you can get archival boxes to store them in. They are not supposed to be in an airtight container. You might be able to get information about storing or displaying them from a local museum. Or perhaps the smithsonian web site?
I myself use my treasures my mom made. She was no way as talented as your grandma, but, I can tell you this. I have enjoyed them being out where I can see them.