I'll defer to Occam's Razor and say that the Mail probably has a machine that's a bit buggy or imperfect.
The US Postal Service processed 116 billion parcels in 2023[1]. If they had counterfeit stamp detectors that gave false positives 0.0001% of the time, that's still 116,000 bogus fines per year. And the engineers might have no way to reproduce the glitch, because it's so improbable.
The US Postal Service processed 116 billion parcels in 2023[1]. If they had counterfeit stamp detectors that gave false positives 0.0001% of the time, that's still 116,000 bogus fines per year. And the engineers might have no way to reproduce the glitch, because it's so improbable.
[1]: https://www.statista.com/statistics/320234/mail-volume-of-th...