When dealing with Used tire companies in Japan, its always safe to ask the company to provide you with a pdf copy of their Export Dealer License Number ( KCC Export Japan’s Export license number is 621110131112 ). In fact it is required by law in Japan for all registered companies to have this number displayed on the company’s website.
Also, if you ever have to pay a deposit or full payment, make sure the NAME of the bank account is the SAME name of the company you are dealing with, and not a personal bank account. It is safer to pay to the company account than a personal account.