...here's a suggestion.
I got my Oswald DVD a few days ago, and inside it was a freebie button. It was shrink wrapped so that the pin doesn't poke holes in the paper incerts. The plastic wrapping has the same texture of a very thin shrinkie-dink and even comes with a hole big enough to put a pair of safety scissors through to cut it off the button. It's no bigger than the button you guys had made for the Season 1 Case File. Same kind of pin-backing too.
I am just throwing this out there because myself and others that loved the Season 1 Case Files had to deal with something getting a little damaged as a result of the button. In my case it was the postcard. For others, it was the magnet or the glasses. I think buy looking into this shrink-wrap protection, you will end up protecting the other items in the Case File for Season 2... again, if you are making a pin for that one. ;)