I sure hope the buyer sent some questions to the seller and convinced him to test it, because otherwise I don't see how this box is worth $517 when it doesn't even power on.
Shill bidding, perhaps?
http://www.ebay.com/itm/Sanyo-M-X920-Portable-AM-FM-Cassette-Player-2-Way-Stereo-Boombox-Parts-Repair-/401136529284?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=WOj9N1r0tI%252BLEyOm51tzhOpb0wg%253D&orig_cvip=true&rt=nc
Shill bidding, perhaps?
http://www.ebay.com/itm/Sanyo-M-X920-Portable-AM-FM-Cassette-Player-2-Way-Stereo-Boombox-Parts-Repair-/401136529284?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=WOj9N1r0tI%252BLEyOm51tzhOpb0wg%253D&orig_cvip=true&rt=nc