Those guitars have been sold at Yahoo Auction (Japanese version). It depends whether sellers are dealers or not. I tend to think that if the seller has too many "very good" evaluation from past buyers - for example more than 1000 -, then the seller can be regarded as a dealer or quasi professional trader.
I have added three pics of "1980, LS-80, Cherry Sunburst, Stored at the corner of a room for more than 20 years, rarely played, DiMarzio PAF, with original hard case". It's price has been going up, but still Yen 44k (US$440) as of today.
http://rsdaizo.hp.infoseek.co.jp/newpage13.shtml