I told the seller it was a fake. He said he would verify SN with Zeiss, otherwise he said the listing is staying up.
The seller ended it.
He ended it right after I sent him a message.
"You have been told by a number of people that the scope is a fake. If you cared to exercise diligence, it'd be easy for you to see. By continuing to list the item you are engaging in fraud, and defrauding someone for that amount of money may rise to the level of a felony."