Learned about it from the seller in CA:
About 120,000 letters from around Orange County burned in a fiery crash Tuesday morning involving two big-rigs on the 57 freeway. The fire closed northbound lanes for hours, and officials said all the mail – which included letters and large envelopes – was destroyed.
The mail came from the U.S. Postal Service processing center in Santa Ana and was headed around the country,
Postal Service spokesman Richard Maher said.
Anyone who mailed a non-local letter Monday from ZIP codes starting with 926, 927, 928, 906, 917 and 918 is affected.