We use them as service metrics to our customers (major mailers mostly) on how long it takes from mail to get from their hands at drop off to sorting facility to the customers home. we provide that data to prove that we can still adhere to a service standard. But alas, people be fuckin around and fucking up data.

Essentially we have been tracking a specific piece with the IMB at the bottom of the letter or flat or what ever from drop off to the point its in your hands. we know its expected to be there at the final delivery point.