First, is it a fact that he bought the sign from the other guy... the auction winner is hidden, so unless you sold it to him I'm not sure how you can assume he won it.
It doesn't take a "rocket scientist" to see he bought it and is now selling it, they left feed back to each other for the item.
Second, if you didn't sell it to him, do you know the original seller didn't tell him that history?
This is true, never said "he" was the one who found it. original seller could of told him the story.
"THIS IS AS GOOD AS THEY GET FOUND IN A BOX IN A ESTATE SALE OLD MAN WORKED FOR TEXACO 54 YEARS KEEP EVER THING."
Looks like he is just trying to flip it and make some money.