From Anna Havron’s Analog Office blog, a suggestion to keep a canonical Where Is It? file, a pointer to where all the things are kept.
I spend 3% of my energy worrying about where the safe deposit box key is (and another 0.5% wondering why I still have a safe deposit box). I worry about where the passports are. And Olivia’s birth certificate. And the spare key to the Kia Soul. So I’ve done as suggested and created a shared Notes folder into which I’m pouring notes about all those things the location of which is not immediately obvious.