The details of selling/shipping overseas

I sent a package to Hong Kong but not sure how that compares to Japan. I used USPS Global Priority & it arrived in 3 days w/ no problems whatsoever. It was also the least expensive way to ship at the time, which has been about a year.

A few years ago, I sold a very heavy Keith Monks Audio Labs record cleaning machine to a buyer in Germany. The buyer wired transfered the funds to my bank account, and in turn, arranged for the shipping via BAX Global. He prepaid the shipping, insurance and any duty/VAT. BAX came to my home with a truck, picked up the machine, I signed off on it and it was delivered to the buyer in Germany within 10 days, with NO damage.

DHL is another company that is reliable and inexpensive.
The trick is that most shipping companies like BAX and DHL work only with companies, not individuals.

Have the buyer prepay through wiretransfer from his bank to yours. See to it that he carries bankcharges, which are quite stiff and have him pay shipping through Bax Global, which will pick up the goods and deliver house to house.