I think its admirable of you to attempt to locate the people who purchased the rifles that went with the cases. I flabbergasted the rifles were not sold with the cases in the first place. You would think that an auction house would know that the rifles should be sold with them and would actually demand a higher price. I've only read about the cases here in the forum but never knew how much one would cost or if a normal blue collar Joe, could even afford one.
I would love to see pictures of the inside and how they work. One of the guys on the forum made one for his rifle so I've seen that would be cool to see a real one.