Both tractor's pics show me p*6S poor paint prep on the frame rails, ROPS, etc.
Japan is an island, right? Seems to get product to USA would entail shipping the tractor across a LARGE body of salt water, where salt spray, and a salt infested air environment could would lead to salt corrosion/oxidation. If stored in a box inside a bag is the standard transport method, then it is possible the tractor was exposed to salt spray or a storm in which salt water was present in the air. Regardless of how it got there there is now massive corrosion at work which won't stop at a protective layer, self sacrificing the outer layer and not allowing deeper layers to corrode. I've never heard anything so absurd in my entire life. :duh:
It was not likely under water, salt or otherwise, but it is a 'lemon' for all intents and purposes. Sealed electrical connectors are fine- BUT the metal they need to ground to is not going to be there in short order.
I'd be inclined to return it to selling dealer with the keys and ask for a full refund or exchange for a different tractor. Otherwise contact equivalent of BBB, Attorney General for province of jurisdiction, etc.
The BX is assembled in the US.