Customs found seal sporrans in one of their shipments over a year ago, and they were warned not to ship them to the USA anymore. Apparently the customs people have been checking their incoming packages since the warning. The Feds said it was an investigation that has been ongoing for over a year.

I would suspect that the customs notified the Feds that a shipment was on it's way to the shop, as they showed up a 1/2 hour after the delivery.