I maintain an inventory of my stash in MS Word. When I open a box to start a kit, it stays on the bench until it's finished. I have NEVER started a kit and not finished it. Don't plan to ever do that either.
Having a list is very handy when attending events that have kits for sale. I can easily check my list and not get duplicates. I keep a copy in my truck too. Never know when a kit opportunity will come along.