Filter Remaining for Complete Set - How many Loose Carts Remain for example

I collect NES and I own some boxes without carts, carts without boxes etc.  I only see a total # of NES items I have, which really doesn't paint the real picture, nor does sit allow me to quickly see if I have that cartridge when I find it out in the wild.  It would be much easier to see a list of carts I do not own.