Here’s an audio forum reference to a past LUXMAN cd tube website warning for counterfeit for cd tube fakes .
Looks like L UXMAN were not ( are not?) immune from cheap ad fakes on eBay and the like. Admittedly I don’t have the time to crawl through the current discussions for the current state. The “fakes” are likely “B” and “C” grade refurbs and repairs on faulty returns, rather the classic illegal counterfeit POS build cable fakes made in China.
So …does this validate the OP’s assessment of higher risk when buying from anybody that than a bona fide and reputable audio dealer, or at least from a healthy prior positive feedback private seller fully registered with a robust history on AGON, USAUDIOMART, CAM etc.?
me … I wouldn’t buy it on eBay and it’s all too many dodgy listings. Instead …. Buy NA dealers or registered audio forum members as a cheap cost of insurance IMO.