Apologies, I didn't read the bottom of your crowdsupply campaign where you referenced this, and I dont remember seeing an option for registered mail when I bought the item originally. It is certainly possible that I missed the option, being that I missed it in your campaign originally. I've never really had to do that on any other item I've backed from there, and it seems I've also misunderstood CrowdSupply's process where I thought they were doing all the shipping once the product was finished. No worries on it taking longer than 3 weeks, I am sure it will turn up. I will let you know in a few weeks if it doesn't.
Thanks for the info.