Oh, I dunno. We had a very helpful Verizon tech out to the Providence office a few months back.
The small basement under the front part of the office floods on a semi-regular basis. Conveniently, this is where some monster 3-phase electrical switchgear is located (former chicken slaughterhouse - the entire warehouse area was a walk-in cooler), plus a couple of NIDs housing the ten incoming lines.
The latest flood was a doozy, submerging the NIDs for the first time in memory. When the water subsided, the electric was repaired and Verizon came in to restore service. I arrived a few days later to replace the cable running to the phone system, and found there were some unfamiliar numbers present in the NIDs.
Long story long, the tech had noticed some faded Sharpie labeling on unused bonding posts, and had helpfully restored all of them! Of course, they belonged to other Verizon customers.
