Thanks to Ken, Wally and Joe for your comments.  No progress yet but the UPS phone folks are starting to recognize me. I am talking to the international department, but they can't answer my questions. This concertina was shipped last Friday--a week ago. I've submitted the form 505 and paid over $700 in import duty (which in my innocence I was not expecting!). Jurgen told me on the phone this morning that it "used to be a lot simpler;" he doesn't know what the problem is either.