Kittens!
The secret to this game is kittens.
I don't just mean that kittens are the best good (though they are). I mean that I played this game like a kitten.
That is, I hide in the shadows, ambush weak prey and ruthlessly tear them to shreds before they can react, and then retreat back to the shadows before bigger predators notice me.
Using this, I have managed to get second place in the world for most kittens stashed, at 1255 boxes.
I want to emphasize that I did not use any bots/scripts whatsoever to do so. It was 100% manual. I also did it almost entirely by myself (there was one other nation in my region, Free Stalliongrad, that helped out a little bit, and I think two other nations that stashed exactly one good each, and I shipped a measly five crates of inspector uniforms over from a puppet at the very beginning of the event, but it was 99% Trotterdam).
All it took is a combination of clever tactics, a sociopathic disregard for other players' feelings, and going an unhealthy amount of time without sleep.
This does mean that I am personally responsible for a large number of players declaring this game to be no fun at all, but that's kittens for you.
The good news is: our new kitten petting zoo is now open for interregional tourists! Admission prices are very reasonable! If I stole from you, you get a 20% discount!