To re-emphasize what someone else pointed out, the JPY200,000 limit applies to "market value," not what you paid for them. Unless they are new and in the original packaging, you need only consider their current value on the resale market.

You don't say what country you're from. Assuming it's the US, here's another Customs issue to think about, assuming you want to cover all angles or are paranoid: returning to the US. If US Customs gets the sense that any of your items were acquired abroad, they may require you to pay import duty when returning to the US. Purchase receipts would help in such a situation, but for the ultra-paranoid, the only sure thing is to register your items with Customs before you leave. You can do this at the airport at the port of exit from the US: you present your items to them, and they'll catalog them onto a form to establish that you had them with you before you left the US.

I do see where you're coming from with your original question. For those without country-specific experience, it's sometimes hard to tell which of the stated regulations are strictly enforced, and which are largely ignored. In many countries, low import duty limits for visitors get added at a time in history when there are high import duties in general, and thus a thriving black market involving people bringing in goods for resale. Then the economic situation changes, tariffs go away, and this is no longer a big concern, but the Customs rules including the declaration remain in place, but are just not enforced. How is one to know? I remember the first time I visited South Korea. The paperwork made it sound like they were very concerned about this, including items like expensive cameras and laptop computers. According to the rules, my laptop had to be declared (not for taxes, but so that it could be registered and then verified that I had it with me when I left, else there would be taxes at that point). Customs, at least at the time, was a Green Lane / Red Lane setup. Green Lane people were just waved through without inspection. They had to open up a Red Lane for me, as I was the only one trying to use it. When they saw that I was just declaring my laptop, they just kind of laughed and waved me through. But how was I to know? On my next visit, I knew what the real rules were, even if the form still technically directed me to the red lane for a laptop.