Finally the package did indeed show up at my school, a bit worse for wear but still in one piece and, miraculously, unopened. But the real surprise came when I inspected the papers stuck to the top of the box:
It seems our package made a detour to Sri Lanka on the way from Ohio to Hiroshima. How that happened is anyone's guess, but it was kinda neat to see the package had gone all that way.
As for the Peeps, they tasted even better than I remembered. Thanks Mom and Dad.