Kristina Dutton needed her packages before embarking on an overseas trip. They contained specialized sound recording equipment from the U.K., Australia, and Eastern Europe, and she was leaving in two days.

To her relief, she received a notice from the shipper that the packages had arrived in Inverness. They weren’t at her house, so she assumed they were being held at the post office. But when she arrived to pick them up, the postmaster informed…