This sounds great, except: how do you know if you've already labelled a box today or not? How do you prevent double, triple, or quadruple labelling?

BTW: gonna take a lot of ideas from this article, thanks for sharing!

short term memory, but I'll admit it isn't perfect and sometimes I'm pretty sure that I might be double labelling. But that's okay because even an occasional mistaken double label is still a partially valid signal that the box is being used a lot.