Honestly i don't know. Angela has a computer, plus she still has her notebooks for other records. All i know is that they are aware of people just handing out PIN's, which is why they link the PIN to the phone number originally used.
Someone could have made a visit, had some altercation, then thought you know what, i'm never coming here again, let me just give my PIN to everyone, screw them!
Well they thought of that too, so that's why just passing a PIN around won't work.
I honestly never had to use my PIN. I don't even remember it. They already know me well enough that it's not needed.