ProTip: Platypi hatch from eggs, which are much easier to ship.  The eggs take 10 days to hatch.

Sure you could label it some other species and pay for whatever Super Awesome Ultra Deluxe Shipping they have.

So, a little more research and you can just post for someone in Australia to obtain and ship the egg for a bounty.

Have you given any thought to how you'll get it inoculated against the various germs and viri in the air where you live that it's surely not going to have an immunity to?  You probably won't be able to take it to the vet.  That means that if it turns out to be male, you won't be able to get it de-venomed either.  You'll have a very cute, poisonous mammalian duck freak waddling around your house.  Has your friend thought this through?