Hey Bill,
It could have just been a fluke. It sounds like you've been pretty happy with the PO service up to now. Maybe if you just give the folks you know down there a heads up, or perhaps you could put a hold on the mail to your PO box for a couple of weeks until the package arrives. I hope they would hold everything until you pick it up and release the hold, and there's no harm asking them about your situation specifically.
How badly do you want that board? lol.