The one on the left has gold top and legs and a gold lid, the other 3 only have a small amount. It will cost more to buy and ship at that price than what you will be able to recover for values. He is sell as refurbished chips so he will possibly getting more than gold content value.
That generation of eprom can be erased and reprogrammed using UV light. They are useful for the repair of old arcade machines and likely have more value as working components than the scrap value to the right person.
It seems like I have to pay $10+ for eproms when I need
to change the emulation in some of the Okidata printers
that I refurbish and sell. (Programmed eproms - not blanks).