I like to "to be used" folder idea. I have too many kits I've purchased but haven't used yet! I'm definitely a hoarder (thanks Kristin for making me feel better). My mostly "never used" kits are the SSD mega collabs or the free with purchase kits. I don't know why this happens...I always want to have them and make purchases to get the goodies but somehow I usually forget about having them.
Here's just 2 of the kits I've never used