Ever "found" valuable vintage furniture?

I have some nice Herman Miller Eames chairs shell type, and I had a DAR also. If everybody wants to cringe, when my grandmother moved to a nursing home my cousins had a yard sale for most of her furniture and other thing that she did not need any longer. Like, real Arco lamp-$45!!!( AHHHHHHHH!!!), Nelson clocks (two ,don’t know how much they went for but it is safe to say it was well below market). And a LOT of original Knoll and other random Danish modern/mid-cent. furniture. My grandfather was a salesman at a furniture store in Chicago whilst in grad school and then was in college administration. I did get a nice walnut coffee table that is unlabeled but really well made.