I just finished listening to the episode, and wow! I love finding and listening to older media. The "Crown Jewel" in my collection is an Edison Record. Sadly it came to me broken, but I do have all of the pieces and the cardboard storage cylinder is whole, so even if I do ever find a player, I couldn't play it. 

For those interested, here's a link to info on Edison Cylinder records

https://cylinders.library.ucsb.edu/history-goldmoulded.php