I may be able to add something to this conversation. I noticed that when you access the e-shop, it deletes DLC for games that you already own DLC for. Not games you never bought DLC for. I legitimately own a theme, some Hyrule Warriors DLC, and FE:Birthright via DLC. Those are the DLC's I own...
@The Real Jdbye, I thought about that and I have blank DVD's and Blurays but honestly after like 90 songs I just listen to it a couple of hundred times toss it out and burn something else or have like 2-3 CD's. Florida here the heat in the car tends to ruin the CD's after like a few months even commercial pressed ones don't last too long.