A tab for incomplete games in your collection

You can filter your collection to "Box Only" or "Item and Box" etc to find these items now.  Here is an example for my admin collection:

https://www.pricecharting.com/offers?status=collection&seller=dx2vp7qam7omfdwgu7jk6mw4f4&sort=starts&category=all&condition-id=8

You change the Filter by "Includes Only" to the value you want to see.  It doesn't include all of them at once, but it will show you only incomplete if you look at a couple different filters.