Hi Kay,
I haven't come across anything about a case for these either. Having said that, I haven't come across anything at all about the packaging in which these were delivered. The regulations show that once the applications for the award of the badge had been processed by the RJF Personalamt that batches of the badges and the award certificates (Besitzurkunde) were sent out to the respective Bann. The Bann then organised a parade where members of the "Alte Garde" were presented with their badges and certificates. I'm guessing that the Personalamt simply put a batch into a large box and sent it out to the Bann.