It links to identity of whoever purchased them with credit card. Or whoever stood in front of the camera when transaction for these stamps was registered.
> It links to identity of whoever purchased them with credit card.
How do you think this happens? The codes are not scanned at the shop.
> when transaction for these stamps was registered.
Where is this registered?
I'd bet money in a forensic scenario they could look up the batch and then estimate the sequence and thus date of sale and pull the post office cctv footage.