You can't label the plugs because you won't be getting the same stuff back. I think stern is just sending people all new populated PFs and not swapping Their used stuff over to a new one. All I can think of is to take a pic of the board with all the plugs still plugged in and take a pick of each plug as you pull it off right near where it came at off the board and maybe label it first. I never did a swap on a Stern.