Thank you! I warn you, you will be tempted to just throw an entire box out, and some of them once opened contain nothing you even remember or care about today. But others have things that stop your breath.
It's not easy, and it takes A VERY LONG TIME. Every night I pull a box out (there were a lot of boxes! The photographs were the worst!), set it next to the couch, and go through it while watching some TV show. For this box I was watching Madame Secretary, which I pretty much hate because it's propaganda, so I could concentrate on the stuff instead.