The clerk was Rich's wife. That's one of the goofy things about being at a small overseas post: all the ordinary working people--postal clerks, store clerks, etc--are family members of the people you work with. It's kind of fun. Doesn't keep them from insisting on seeing your ID on every visit, though.
And no, we did not have to recalculate the postage for the first two packages, so I guess when you look at it the right way, we got away with one. Or two.