It now appears to have come from China, rather than Japan. I've actually properly looked at the packing slip. Shipped via EMS (http://www.ems.com.cn/ems/English/) and I've tracked the item, which appears to have originated from "速递揽收", if that means anything to anyone.
*shrugs* I'm still in the dark!
Off to swim.
*shrugs* I'm still in the dark!
Off to swim.