Arthur just has to use enough postage to get to Canada. The address is: Santa Claus, North Pole, Canada, H0H 0H0 and he will even get a reply. This service has been offered for quite a number of years.

Looks like a 2oz letter to Canada is USD1.00

The same USPS page give the price for Russia as USD1.82

I'd forgotten about that postal code, that's a good one, Oh Canada.

I just think it's SO Arthur to think this through to the bitter end. :)

... and in regards to the box, it makes me think of the Warner Brother's knockoff of Abbott and Costello.... "Don't put me in the box, Babbit, It'd DARK in there, I'm SCARED of the DARK!" :)