I don't know if this is typical for USPS but about 2 months ago I got a shipment of corals and the sender used USPS. My regular mail comes around 2PM. The overnighted USPS package was delivered at 10:30AM by a different USPS driver than my regular mailman. Since then I assumed overnight packages are delivered by "overnight" delivery men and not regular mailmen. Maybe someone should check with USPS and see if overnighted packages are delivered on the regular mail truck or if they have dedicated overnight package delivery men that will get the package delivered earlier.
USPS Express/USPS Priority is sometimes guaranteed by 10:30AM, just like UPS and FedEx. It all depends on the recipient's zip code.
In fact, I recently shipped corals to someone, here on R2R. His zip code didn't qualify for USPS Express/Priority, next day service, even though he was only 1 state away. However, using the zip code of a different Post Office, that was only a few miles from his home/work, that zip code did qualify, if Held For Pickup. This saved A LOT of money, on shipping fees and he was able to pick up the package, at that Post Office, early morning.
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