Well I think Jason has it correct, the two on the right are indeed fakes - however when you look at the prices some on eBay are charging for one fake, the $400 for two "real" plus two throwaways is not that bad!
https://www.ebay.com/itm/287338935344
Also found in the Cornell University Museum https://emuseum.cornell.edu/search/98.103.017 Like many museums it has several cast fakes!
You are right to give the auction a miss - or you could ask if the lot can be split, unlikely as how would the owner get rid of the fakes!