Unless you plan on displaying them at some point I don't really see a reason to keep the boxes. It's a lot easier to fit a cartridge only collection into a few plastic bins. Another way to do it is to just keep the boxes of the games you really like while getting rid of the rest.
Valve finally got me to craft a badge. Team green overkill mode activate! I seem to be in my oh why not it's so cheap state of mind for buying steam games. Picked up Bleed, Shadowrun Returns and Mitsurugi Kamui Hikae so far.
Looks like a solid list for the first six months of 2014. Towerfall, Mario Kart 8 and Transistor could all be on my list too. I've fallen off the souls train for now and I just don't think South Park is funny. The only game that I really enjoyed this year that isn't on this list is Danganronpa.