Josh,
The sword is, without a doubt, real. The tsuba is in question, though. I would lean Mariusz's way and say the tsuba is fake. But, given the state of the entire koshirae, I would just leave the tsuba alone, if I were you. If you decide you want to invest $2500-$3000 in a new polish, then spend another $450 to have new shirasaya made for it. If you don't want to invest such a large sum of money on this sword, then I would leave it as is and enjoy it for what it is. Or, you could let it go back into the wild and continue looking. My 2-cents.
Regards,
Hoanh