I use a strip of paper and scotch tape on non cello sticks and little color office stickies on cello sticks and on the bottom of boxes. I started putting them on all cigars ina box but somewhere in the middle of doing that I realized it was too much. I also have a couple word doc inventories (one for purchases and for sticks received in one way another) to reference. All in all though I pretty much know off the top of my head when something was purchased.