US Postal Service Redefines "Contiguous" United States

Steve was mailing some packages from his home in Virgina to various points in the country, and noticed something strange on his receipt. The packages destined for Pennsylvania and Washington state are leaving the contiguous United States. What?

Have states started seceding again? Has there been a fateful earthquake that has removed the coasts from the mainland, and we somehow slept through it? “It’s either that or the route from Virginia to Pennsylvania is going to be VERY circuitous,” Steve wrote.

Any postal workers or other insightful people who can explain this mystifying note?