Sorry to jump onto this topic so late. Not sure if there have been any new developments in getting the collar out of customs.
I bought an Innotek invisible fence a few weeks ago. It is very similar to their no bark collars - with the "uncomfortable vibration" and all that. Unfortunately, I was ordered by the local court to install one of these as my dogs got out once and killed a goat.
Anyway, back on the subject, I bought it through VetShed online, along with a few other things, but the shipping was delayed on the Innotek stuff, as they order it from overseas. It was, however, delivered directly to me (not through VetShed's warehouse) through the post from America. I can't see why customs would have stopped yours from coming through.
