I've had experience with PP Numbers. They are USELESS as far as customers are concerned. When a PP near me was broken in half, I called Entergy and reported the pole, I gave them (or tried to) the PP number from the metal tag. I was told that that did not point to a specific pole to where they could dispatch a crew.
So what are the numbers for, I think it's some sort of inventory number and doesn't have any relation to the poles location. At least that's what I figured out with my interactions and those of others that have tried to use the PP Number to pinpoint a specific pole's location to report a problem.