I don't catalog them, I don't file them, I don't number them or label them. I have done all of the above in the past. #1 it takes too long and #2 they always get messed up! So, I keep them in a dresser drawer and flip through them to find what I want.. I can usually remember where I stuck "the one" when looking so I am good with this system for now. I know the pic says they are cataloged and all that, but this is an OLD pic! and I do not have 1 drawer full anymore.. I have 2 and will need a 3rd real quick! you saw how many stamps are in 1 case!! I use BOTH sides of my cases. Can you guess how many stamps are in this one drawer alone?? I lost count at 4000. Happy guessing!