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 i

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. [1]: https://www.statista.com/statistics/320234/mail-volume-of-the-usps/ https://www.statista.com/statistics/320234/mail-volume-of-th...