I had ordered another game product from a different company in the US a few weeks ago and it arrived as a similar small packet, post paid in the US, with no extra charge. The only difference that I could see was the Customs Declaration on the first packet gave the contents value as $10 (slight understatement). Perhaps it was the higher declared value of the KE/Shrapnel product which attracted attention. What hurt most was that the additional handling charge resulted in me having to go to the post office to reclaim the packet, the only thing they handled was my money.
I also could not see a 'purchase by download' option in the online shop, although the download had been announced. This is not a complaint as I was happy to go for the boxed version, the above was just a little added surprise.