In normal circumstances, I'd send it back too. But I bought this camera knowing full well that I have no warranty. Fujifilm states clearly, as did the person in the store: No warranty service outside of Japan.
I bought this camera for $600 cheaper than I could in China. That's the price of a slightly misaligned viewfinder.
I'll try your test next time I am out with the camera.
Well, at least it sounds like the adjustment is easily accessible. It helps to have the camera on a tripod when you check the RF. Good luck.