Paranoid postal people

[mtbc]

So that I could validate my home address with the USPS, they generated me a shared secret with seven letters and thirteen digits. Even if everybody in the world were to try a guess at this secret on every second of their lives, it would remain extremely unlikely that anybody would discover it. Either the USPS has a most alarming threat model for the impersonation of residents, or they love an excuse to make people type random nonsense carefully. Perhaps nobody told them about rate limiting of attempts.