Keycaps that came in boxes are labeled and stored on a shelf. Loose caps and switches in bags are sorted into 6.2qt. storage bins with colored lids and I have a note in my notes app with a master list of profiles (eg “Teal lid - DSS Shale, DCS Input” “Yellow lid - Gateron Pink Linear, Tecsee Carrot Linear” etc) because I was having trouble keeping track of everything.